What is the difference between equal-payment and equal-principal amortization?

Equal-payment (annuity) maintains a constant monthly payment where interest decreases and principal increases each month. Equal-principal keeps the principal repayment constant, resulting in larger payments initially that decrease steadily over time, saving total interest overall.

How does paying extra principal every month reduce loan costs?

Extra principal payments directly reduce the outstanding balance ahead of schedule. Because interest is calculated on the remaining balance, reducing principal faster significantly lowers cumulative interest and accelerates your payoff date.

Does changing the display currency affect my calculation?

No. The currency selector alters only currency symbols and regional number formatting. No exchange rate conversion is applied to your financial model.

Loan & Mortgage Amortization Calculator

Calculate monthly mortgage and loan payments, compare equal-payment and equal-principal amortization, model recurring extra principal, and export full CSV schedules.

Loan & Mortgage Amortization Calculator

100% Client-Side

Calculate monthly mortgage and loan payments, compare equal-payment and equal-principal amortization, model recurring extra principal, and export full CSV schedules.

Loan Parameters

Configure your loan amount, interest rate, term, and payment strategy.

Amortization & Interest Trajectory

Interactive Projection

Total Payments: $215,838.45

Total Payments

Monthly Payment

$599.55

Total Principal

$100,000.00

Total Interest

$115,838.45

Total Payments

$215,838.45

Payoff Date

2056-08

Amortization Schedule

Detailed breakdown of periodic payment, principal, interest, and ending balance.

Month	Date	Payment	Principal	Interest	Ending Balance
1	2026-09	$599.55	$99.55	$500.00	$99,900.45
2	2026-10	$599.55	$100.05	$499.50	$99,800.40
3	2026-11	$599.55	$100.55	$499.00	$99,699.85
4	2026-12	$599.55	$101.05	$498.50	$99,598.80
5	2027-01	$599.55	$101.56	$497.99	$99,497.24
6	2027-02	$599.55	$102.06	$497.49	$99,395.18
7	2027-03	$599.55	$102.57	$496.98	$99,292.61
8	2027-04	$599.55	$103.09	$496.46	$99,189.52
9	2027-05	$599.55	$103.60	$495.95	$99,085.92
10	2027-06	$599.55	$104.12	$495.43	$98,981.80
11	2027-07	$599.55	$104.64	$494.91	$98,877.16
12	2027-08	$599.55	$105.16	$494.39	$98,772.00
13	2027-09	$599.55	$105.69	$493.86	$98,666.31
14	2027-10	$599.55	$106.22	$493.33	$98,560.09
15	2027-11	$599.55	$106.75	$492.80	$98,453.34
16	2027-12	$599.55	$107.28	$492.27	$98,346.06
17	2028-01	$599.55	$107.82	$491.73	$98,238.24
18	2028-02	$599.55	$108.36	$491.19	$98,129.88
19	2028-03	$599.55	$108.90	$490.65	$98,020.98
20	2028-04	$599.55	$109.45	$490.10	$97,911.53
21	2028-05	$599.55	$109.99	$489.56	$97,801.54
22	2028-06	$599.55	$110.54	$489.01	$97,691.00
23	2028-07	$599.55	$111.09	$488.46	$97,579.91
24	2028-08	$599.55	$111.65	$487.90	$97,468.26
25	2028-09	$599.55	$112.21	$487.34	$97,356.05
26	2028-10	$599.55	$112.77	$486.78	$97,243.28
27	2028-11	$599.55	$113.33	$486.22	$97,129.95
28	2028-12	$599.55	$113.90	$485.65	$97,016.05
29	2029-01	$599.55	$114.47	$485.08	$96,901.58
30	2029-02	$599.55	$115.04	$484.51	$96,786.54
31	2029-03	$599.55	$115.62	$483.93	$96,670.92
32	2029-04	$599.55	$116.20	$483.35	$96,554.72
33	2029-05	$599.55	$116.78	$482.77	$96,437.94
34	2029-06	$599.55	$117.36	$482.19	$96,320.58
35	2029-07	$599.55	$117.95	$481.60	$96,202.63
36	2029-08	$599.55	$118.54	$481.01	$96,084.09
37	2029-09	$599.55	$119.13	$480.42	$95,964.96
38	2029-10	$599.55	$119.73	$479.82	$95,845.23
39	2029-11	$599.55	$120.32	$479.23	$95,724.91
40	2029-12	$599.55	$120.93	$478.62	$95,603.98
41	2030-01	$599.55	$121.53	$478.02	$95,482.45
42	2030-02	$599.55	$122.14	$477.41	$95,360.31
43	2030-03	$599.55	$122.75	$476.80	$95,237.56
44	2030-04	$599.55	$123.36	$476.19	$95,114.20
45	2030-05	$599.55	$123.98	$475.57	$94,990.22
46	2030-06	$599.55	$124.60	$474.95	$94,865.62
47	2030-07	$599.55	$125.22	$474.33	$94,740.40
48	2030-08	$599.55	$125.85	$473.70	$94,614.55
49	2030-09	$599.55	$126.48	$473.07	$94,488.07
50	2030-10	$599.55	$127.11	$472.44	$94,360.96
51	2030-11	$599.55	$127.75	$471.80	$94,233.21
52	2030-12	$599.55	$128.38	$471.17	$94,104.83
53	2031-01	$599.55	$129.03	$470.52	$93,975.80
54	2031-02	$599.55	$129.67	$469.88	$93,846.13
55	2031-03	$599.55	$130.32	$469.23	$93,715.81
56	2031-04	$599.55	$130.97	$468.58	$93,584.84
57	2031-05	$599.55	$131.63	$467.92	$93,453.21
58	2031-06	$599.55	$132.28	$467.27	$93,320.93
59	2031-07	$599.55	$132.95	$466.60	$93,187.98
60	2031-08	$599.55	$133.61	$465.94	$93,054.37
61	2031-09	$599.55	$134.28	$465.27	$92,920.09
62	2031-10	$599.55	$134.95	$464.60	$92,785.14
63	2031-11	$599.55	$135.62	$463.93	$92,649.52
64	2031-12	$599.55	$136.30	$463.25	$92,513.22
65	2032-01	$599.55	$136.98	$462.57	$92,376.24
66	2032-02	$599.55	$137.67	$461.88	$92,238.57
67	2032-03	$599.55	$138.36	$461.19	$92,100.21
68	2032-04	$599.55	$139.05	$460.50	$91,961.16
69	2032-05	$599.55	$139.74	$459.81	$91,821.42
70	2032-06	$599.55	$140.44	$459.11	$91,680.98
71	2032-07	$599.55	$141.15	$458.40	$91,539.83
72	2032-08	$599.55	$141.85	$457.70	$91,397.98
73	2032-09	$599.55	$142.56	$456.99	$91,255.42
74	2032-10	$599.55	$143.27	$456.28	$91,112.15
75	2032-11	$599.55	$143.99	$455.56	$90,968.16
76	2032-12	$599.55	$144.71	$454.84	$90,823.45
77	2033-01	$599.55	$145.43	$454.12	$90,678.02
78	2033-02	$599.55	$146.16	$453.39	$90,531.86
79	2033-03	$599.55	$146.89	$452.66	$90,384.97
80	2033-04	$599.55	$147.63	$451.92	$90,237.34
81	2033-05	$599.55	$148.36	$451.19	$90,088.98
82	2033-06	$599.55	$149.11	$450.44	$89,939.87
83	2033-07	$599.55	$149.85	$449.70	$89,790.02
84	2033-08	$599.55	$150.60	$448.95	$89,639.42
85	2033-09	$599.55	$151.35	$448.20	$89,488.07
86	2033-10	$599.55	$152.11	$447.44	$89,335.96
87	2033-11	$599.55	$152.87	$446.68	$89,183.09
88	2033-12	$599.55	$153.63	$445.92	$89,029.46
89	2034-01	$599.55	$154.40	$445.15	$88,875.06
90	2034-02	$599.55	$155.17	$444.38	$88,719.89
91	2034-03	$599.55	$155.95	$443.60	$88,563.94
92	2034-04	$599.55	$156.73	$442.82	$88,407.21
93	2034-05	$599.55	$157.51	$442.04	$88,249.70
94	2034-06	$599.55	$158.30	$441.25	$88,091.40
95	2034-07	$599.55	$159.09	$440.46	$87,932.31
96	2034-08	$599.55	$159.89	$439.66	$87,772.42
97	2034-09	$599.55	$160.69	$438.86	$87,611.73
98	2034-10	$599.55	$161.49	$438.06	$87,450.24
99	2034-11	$599.55	$162.30	$437.25	$87,287.94
100	2034-12	$599.55	$163.11	$436.44	$87,124.83
101	2035-01	$599.55	$163.93	$435.62	$86,960.90
102	2035-02	$599.55	$164.75	$434.80	$86,796.15
103	2035-03	$599.55	$165.57	$433.98	$86,630.58
104	2035-04	$599.55	$166.40	$433.15	$86,464.18
105	2035-05	$599.55	$167.23	$432.32	$86,296.95
106	2035-06	$599.55	$168.07	$431.48	$86,128.88
107	2035-07	$599.55	$168.91	$430.64	$85,959.97
108	2035-08	$599.55	$169.75	$429.80	$85,790.22
109	2035-09	$599.55	$170.60	$428.95	$85,619.62
110	2035-10	$599.55	$171.45	$428.10	$85,448.17
111	2035-11	$599.55	$172.31	$427.24	$85,275.86
112	2035-12	$599.55	$173.17	$426.38	$85,102.69
113	2036-01	$599.55	$174.04	$425.51	$84,928.65
114	2036-02	$599.55	$174.91	$424.64	$84,753.74
115	2036-03	$599.55	$175.78	$423.77	$84,577.96
116	2036-04	$599.55	$176.66	$422.89	$84,401.30
117	2036-05	$599.55	$177.54	$422.01	$84,223.76
118	2036-06	$599.55	$178.43	$421.12	$84,045.33
119	2036-07	$599.55	$179.32	$420.23	$83,866.01
120	2036-08	$599.55	$180.22	$419.33	$83,685.79
121	2036-09	$599.55	$181.12	$418.43	$83,504.67
122	2036-10	$599.55	$182.03	$417.52	$83,322.64
123	2036-11	$599.55	$182.94	$416.61	$83,139.70
124	2036-12	$599.55	$183.85	$415.70	$82,955.85
125	2037-01	$599.55	$184.77	$414.78	$82,771.08
126	2037-02	$599.55	$185.69	$413.86	$82,585.39
127	2037-03	$599.55	$186.62	$412.93	$82,398.77
128	2037-04	$599.55	$187.56	$411.99	$82,211.21
129	2037-05	$599.55	$188.49	$411.06	$82,022.72
130	2037-06	$599.55	$189.44	$410.11	$81,833.28
131	2037-07	$599.55	$190.38	$409.17	$81,642.90
132	2037-08	$599.55	$191.34	$408.21	$81,451.56
133	2037-09	$599.55	$192.29	$407.26	$81,259.27
134	2037-10	$599.55	$193.25	$406.30	$81,066.02
135	2037-11	$599.55	$194.22	$405.33	$80,871.80
136	2037-12	$599.55	$195.19	$404.36	$80,676.61
137	2038-01	$599.55	$196.17	$403.38	$80,480.44
138	2038-02	$599.55	$197.15	$402.40	$80,283.29
139	2038-03	$599.55	$198.13	$401.42	$80,085.16
140	2038-04	$599.55	$199.12	$400.43	$79,886.04
141	2038-05	$599.55	$200.12	$399.43	$79,685.92
142	2038-06	$599.55	$201.12	$398.43	$79,484.80
143	2038-07	$599.55	$202.13	$397.42	$79,282.67
144	2038-08	$599.55	$203.14	$396.41	$79,079.53
145	2038-09	$599.55	$204.15	$395.40	$78,875.38
146	2038-10	$599.55	$205.17	$394.38	$78,670.21
147	2038-11	$599.55	$206.20	$393.35	$78,464.01
148	2038-12	$599.55	$207.23	$392.32	$78,256.78
149	2039-01	$599.55	$208.27	$391.28	$78,048.51
150	2039-02	$599.55	$209.31	$390.24	$77,839.20
151	2039-03	$599.55	$210.35	$389.20	$77,628.85
152	2039-04	$599.55	$211.41	$388.14	$77,417.44
153	2039-05	$599.55	$212.46	$387.09	$77,204.98
154	2039-06	$599.55	$213.53	$386.02	$76,991.45
155	2039-07	$599.55	$214.59	$384.96	$76,776.86
156	2039-08	$599.55	$215.67	$383.88	$76,561.19
157	2039-09	$599.55	$216.74	$382.81	$76,344.45
158	2039-10	$599.55	$217.83	$381.72	$76,126.62
159	2039-11	$599.55	$218.92	$380.63	$75,907.70
160	2039-12	$599.55	$220.01	$379.54	$75,687.69
161	2040-01	$599.55	$221.11	$378.44	$75,466.58
162	2040-02	$599.55	$222.22	$377.33	$75,244.36
163	2040-03	$599.55	$223.33	$376.22	$75,021.03
164	2040-04	$599.55	$224.44	$375.11	$74,796.59
165	2040-05	$599.55	$225.57	$373.98	$74,571.02
166	2040-06	$599.55	$226.69	$372.86	$74,344.33
167	2040-07	$599.55	$227.83	$371.72	$74,116.50
168	2040-08	$599.55	$228.97	$370.58	$73,887.53
169	2040-09	$599.55	$230.11	$369.44	$73,657.42
170	2040-10	$599.55	$231.26	$368.29	$73,426.16
171	2040-11	$599.55	$232.42	$367.13	$73,193.74
172	2040-12	$599.55	$233.58	$365.97	$72,960.16
173	2041-01	$599.55	$234.75	$364.80	$72,725.41
174	2041-02	$599.55	$235.92	$363.63	$72,489.49
175	2041-03	$599.55	$237.10	$362.45	$72,252.39
176	2041-04	$599.55	$238.29	$361.26	$72,014.10
177	2041-05	$599.55	$239.48	$360.07	$71,774.62
178	2041-06	$599.55	$240.68	$358.87	$71,533.94
179	2041-07	$599.55	$241.88	$357.67	$71,292.06
180	2041-08	$599.55	$243.09	$356.46	$71,048.97
181	2041-09	$599.55	$244.31	$355.24	$70,804.66
182	2041-10	$599.55	$245.53	$354.02	$70,559.13
183	2041-11	$599.55	$246.75	$352.80	$70,312.38
184	2041-12	$599.55	$247.99	$351.56	$70,064.39
185	2042-01	$599.55	$249.23	$350.32	$69,815.16
186	2042-02	$599.55	$250.47	$349.08	$69,564.69
187	2042-03	$599.55	$251.73	$347.82	$69,312.96
188	2042-04	$599.55	$252.99	$346.56	$69,059.97
189	2042-05	$599.55	$254.25	$345.30	$68,805.72
190	2042-06	$599.55	$255.52	$344.03	$68,550.20
191	2042-07	$599.55	$256.80	$342.75	$68,293.40
192	2042-08	$599.55	$258.08	$341.47	$68,035.32
193	2042-09	$599.55	$259.37	$340.18	$67,775.95
194	2042-10	$599.55	$260.67	$338.88	$67,515.28
195	2042-11	$599.55	$261.97	$337.58	$67,253.31
196	2042-12	$599.55	$263.28	$336.27	$66,990.03
197	2043-01	$599.55	$264.60	$334.95	$66,725.43
198	2043-02	$599.55	$265.92	$333.63	$66,459.51
199	2043-03	$599.55	$267.25	$332.30	$66,192.26
200	2043-04	$599.55	$268.59	$330.96	$65,923.67
201	2043-05	$599.55	$269.93	$329.62	$65,653.74
202	2043-06	$599.55	$271.28	$328.27	$65,382.46
203	2043-07	$599.55	$272.64	$326.91	$65,109.82
204	2043-08	$599.55	$274.00	$325.55	$64,835.82
205	2043-09	$599.55	$275.37	$324.18	$64,560.45
206	2043-10	$599.55	$276.75	$322.80	$64,283.70
207	2043-11	$599.55	$278.13	$321.42	$64,005.57
208	2043-12	$599.55	$279.52	$320.03	$63,726.05
209	2044-01	$599.55	$280.92	$318.63	$63,445.13
210	2044-02	$599.55	$282.32	$317.23	$63,162.81
211	2044-03	$599.55	$283.74	$315.81	$62,879.07
212	2044-04	$599.55	$285.15	$314.40	$62,593.92
213	2044-05	$599.55	$286.58	$312.97	$62,307.34
214	2044-06	$599.55	$288.01	$311.54	$62,019.33
215	2044-07	$599.55	$289.45	$310.10	$61,729.88
216	2044-08	$599.55	$290.90	$308.65	$61,438.98
217	2044-09	$599.55	$292.36	$307.19	$61,146.62
218	2044-10	$599.55	$293.82	$305.73	$60,852.80
219	2044-11	$599.55	$295.29	$304.26	$60,557.51
220	2044-12	$599.55	$296.76	$302.79	$60,260.75
221	2045-01	$599.55	$298.25	$301.30	$59,962.50
222	2045-02	$599.55	$299.74	$299.81	$59,662.76
223	2045-03	$599.55	$301.24	$298.31	$59,361.52
224	2045-04	$599.55	$302.74	$296.81	$59,058.78
225	2045-05	$599.55	$304.26	$295.29	$58,754.52
226	2045-06	$599.55	$305.78	$293.77	$58,448.74
227	2045-07	$599.55	$307.31	$292.24	$58,141.43
228	2045-08	$599.55	$308.84	$290.71	$57,832.59
229	2045-09	$599.55	$310.39	$289.16	$57,522.20
230	2045-10	$599.55	$311.94	$287.61	$57,210.26
231	2045-11	$599.55	$313.50	$286.05	$56,896.76
232	2045-12	$599.55	$315.07	$284.48	$56,581.69
233	2046-01	$599.55	$316.64	$282.91	$56,265.05
234	2046-02	$599.55	$318.22	$281.33	$55,946.83
235	2046-03	$599.55	$319.82	$279.73	$55,627.01
236	2046-04	$599.55	$321.41	$278.14	$55,305.60
237	2046-05	$599.55	$323.02	$276.53	$54,982.58
238	2046-06	$599.55	$324.64	$274.91	$54,657.94
239	2046-07	$599.55	$326.26	$273.29	$54,331.68
240	2046-08	$599.55	$327.89	$271.66	$54,003.79
241	2046-09	$599.55	$329.53	$270.02	$53,674.26
242	2046-10	$599.55	$331.18	$268.37	$53,343.08
243	2046-11	$599.55	$332.83	$266.72	$53,010.25
244	2046-12	$599.55	$334.50	$265.05	$52,675.75
245	2047-01	$599.55	$336.17	$263.38	$52,339.58
246	2047-02	$599.55	$337.85	$261.70	$52,001.73
247	2047-03	$599.55	$339.54	$260.01	$51,662.19
248	2047-04	$599.55	$341.24	$258.31	$51,320.95
249	2047-05	$599.55	$342.95	$256.60	$50,978.00
250	2047-06	$599.55	$344.66	$254.89	$50,633.34
251	2047-07	$599.55	$346.38	$253.17	$50,286.96
252	2047-08	$599.55	$348.12	$251.43	$49,938.84
253	2047-09	$599.55	$349.86	$249.69	$49,588.98
254	2047-10	$599.55	$351.61	$247.94	$49,237.37
255	2047-11	$599.55	$353.36	$246.19	$48,884.01
256	2047-12	$599.55	$355.13	$244.42	$48,528.88
257	2048-01	$599.55	$356.91	$242.64	$48,171.97
258	2048-02	$599.55	$358.69	$240.86	$47,813.28
259	2048-03	$599.55	$360.48	$239.07	$47,452.80
260	2048-04	$599.55	$362.29	$237.26	$47,090.51
261	2048-05	$599.55	$364.10	$235.45	$46,726.41
262	2048-06	$599.55	$365.92	$233.63	$46,360.49
263	2048-07	$599.55	$367.75	$231.80	$45,992.74
264	2048-08	$599.55	$369.59	$229.96	$45,623.15
265	2048-09	$599.55	$371.43	$228.12	$45,251.72
266	2048-10	$599.55	$373.29	$226.26	$44,878.43
267	2048-11	$599.55	$375.16	$224.39	$44,503.27
268	2048-12	$599.55	$377.03	$222.52	$44,126.24
269	2049-01	$599.55	$378.92	$220.63	$43,747.32
270	2049-02	$599.55	$380.81	$218.74	$43,366.51
271	2049-03	$599.55	$382.72	$216.83	$42,983.79
272	2049-04	$599.55	$384.63	$214.92	$42,599.16
273	2049-05	$599.55	$386.55	$213.00	$42,212.61
274	2049-06	$599.55	$388.49	$211.06	$41,824.12
275	2049-07	$599.55	$390.43	$209.12	$41,433.69
276	2049-08	$599.55	$392.38	$207.17	$41,041.31
277	2049-09	$599.55	$394.34	$205.21	$40,646.97
278	2049-10	$599.55	$396.32	$203.23	$40,250.65
279	2049-11	$599.55	$398.30	$201.25	$39,852.35
280	2049-12	$599.55	$400.29	$199.26	$39,452.06
281	2050-01	$599.55	$402.29	$197.26	$39,049.77
282	2050-02	$599.55	$404.30	$195.25	$38,645.47
283	2050-03	$599.55	$406.32	$193.23	$38,239.15
284	2050-04	$599.55	$408.35	$191.20	$37,830.80
285	2050-05	$599.55	$410.40	$189.15	$37,420.40
286	2050-06	$599.55	$412.45	$187.10	$37,007.95
287	2050-07	$599.55	$414.51	$185.04	$36,593.44
288	2050-08	$599.55	$416.58	$182.97	$36,176.86
289	2050-09	$599.55	$418.67	$180.88	$35,758.19
290	2050-10	$599.55	$420.76	$178.79	$35,337.43
291	2050-11	$599.55	$422.86	$176.69	$34,914.57
292	2050-12	$599.55	$424.98	$174.57	$34,489.59
293	2051-01	$599.55	$427.10	$172.45	$34,062.49
294	2051-02	$599.55	$429.24	$170.31	$33,633.25
295	2051-03	$599.55	$431.38	$168.17	$33,201.87
296	2051-04	$599.55	$433.54	$166.01	$32,768.33
297	2051-05	$599.55	$435.71	$163.84	$32,332.62
298	2051-06	$599.55	$437.89	$161.66	$31,894.73
299	2051-07	$599.55	$440.08	$159.47	$31,454.65
300	2051-08	$599.55	$442.28	$157.27	$31,012.37
301	2051-09	$599.55	$444.49	$155.06	$30,567.88
302	2051-10	$599.55	$446.71	$152.84	$30,121.17
303	2051-11	$599.55	$448.94	$150.61	$29,672.23
304	2051-12	$599.55	$451.19	$148.36	$29,221.04
305	2052-01	$599.55	$453.44	$146.11	$28,767.60
306	2052-02	$599.55	$455.71	$143.84	$28,311.89
307	2052-03	$599.55	$457.99	$141.56	$27,853.90
308	2052-04	$599.55	$460.28	$139.27	$27,393.62
309	2052-05	$599.55	$462.58	$136.97	$26,931.04
310	2052-06	$599.55	$464.89	$134.66	$26,466.15
311	2052-07	$599.55	$467.22	$132.33	$25,998.93
312	2052-08	$599.55	$469.56	$129.99	$25,529.37
313	2052-09	$599.55	$471.90	$127.65	$25,057.47
314	2052-10	$599.55	$474.26	$125.29	$24,583.21
315	2052-11	$599.55	$476.63	$122.92	$24,106.58
316	2052-12	$599.55	$479.02	$120.53	$23,627.56
317	2053-01	$599.55	$481.41	$118.14	$23,146.15
318	2053-02	$599.55	$483.82	$115.73	$22,662.33
319	2053-03	$599.55	$486.24	$113.31	$22,176.09
320	2053-04	$599.55	$488.67	$110.88	$21,687.42
321	2053-05	$599.55	$491.11	$108.44	$21,196.31
322	2053-06	$599.55	$493.57	$105.98	$20,702.74
323	2053-07	$599.55	$496.04	$103.51	$20,206.70
324	2053-08	$599.55	$498.52	$101.03	$19,708.18
325	2053-09	$599.55	$501.01	$98.54	$19,207.17
326	2053-10	$599.55	$503.51	$96.04	$18,703.66
327	2053-11	$599.55	$506.03	$93.52	$18,197.63
328	2053-12	$599.55	$508.56	$90.99	$17,689.07
329	2054-01	$599.55	$511.10	$88.45	$17,177.97
330	2054-02	$599.55	$513.66	$85.89	$16,664.31
331	2054-03	$599.55	$516.23	$83.32	$16,148.08
332	2054-04	$599.55	$518.81	$80.74	$15,629.27
333	2054-05	$599.55	$521.40	$78.15	$15,107.87
334	2054-06	$599.55	$524.01	$75.54	$14,583.86
335	2054-07	$599.55	$526.63	$72.92	$14,057.23
336	2054-08	$599.55	$529.26	$70.29	$13,527.97
337	2054-09	$599.55	$531.91	$67.64	$12,996.06
338	2054-10	$599.55	$534.57	$64.98	$12,461.49
339	2054-11	$599.55	$537.24	$62.31	$11,924.25
340	2054-12	$599.55	$539.93	$59.62	$11,384.32
341	2055-01	$599.55	$542.63	$56.92	$10,841.69
342	2055-02	$599.55	$545.34	$54.21	$10,296.35
343	2055-03	$599.55	$548.07	$51.48	$9,748.28
344	2055-04	$599.55	$550.81	$48.74	$9,197.47
345	2055-05	$599.55	$553.56	$45.99	$8,643.91
346	2055-06	$599.55	$556.33	$43.22	$8,087.58
347	2055-07	$599.55	$559.11	$40.44	$7,528.47
348	2055-08	$599.55	$561.91	$37.64	$6,966.56
349	2055-09	$599.55	$564.72	$34.83	$6,401.84
350	2055-10	$599.55	$567.54	$32.01	$5,834.30
351	2055-11	$599.55	$570.38	$29.17	$5,263.92
352	2055-12	$599.55	$573.23	$26.32	$4,690.69
353	2056-01	$599.55	$576.10	$23.45	$4,114.59
354	2056-02	$599.55	$578.98	$20.57	$3,535.61
355	2056-03	$599.55	$581.87	$17.68	$2,953.74
356	2056-04	$599.55	$584.78	$14.77	$2,368.96
357	2056-05	$599.55	$587.71	$11.84	$1,781.25
358	2056-06	$599.55	$590.64	$8.91	$1,190.61
359	2056-07	$599.55	$593.60	$5.95	$597.01
360	2056-08	$600.00	$597.01	$2.99	$0.00
Total		$215,838.45	$100,000.00	$115,838.45	$0.00

How Fixed-Rate Loan Amortization Works

Loan amortization is the scheduled repayment of debt principal and accrued interest through regular periodic installments over a defined time horizon. Each payment is divided into an interest portion (the cost of borrowing against the current outstanding balance) and a principal portion (equity repayment that reduces the debt).

Equal Payment (Annuity) vs. Equal Principal (Linear)

Equal-Payment Amortization (Fixed Monthly Installment): The borrower pays a constant dollar amount every month. In early periods, interest comprises the bulk of the payment; over time, as the remaining balance declines, interest drops and principal repayment accelerates until the loan reaches a zero balance.
Equal-Principal Amortization (Decreasing Monthly Installment): The borrower pays a fixed amount of principal each month plus whatever monthly interest has accrued on the remaining balance. Installments start higher and decrease steadily, resulting in faster principal reduction and lower total interest paid over the life of the loan.

Mathematical Formulas

P_periodic = L * [ r * (1 + r)^n ] / [ (1 + r)^n - 1 ]

L = Initial loan principal balance
r = Periodic monthly interest rate (Annual Rate / 12)
n = Total number of monthly installments (Term in Years × 12)

Benefits of Additional Principal Payments

Making recurring additional principal payments directly reduces the outstanding debt ahead of schedule. Because interest is computed on the remaining principal balance, extra payments compound into significant cumulative interest savings and substantially shorten the time to debt-free ownership.

Frequently Asked Questions

What is the difference between equal-payment and equal-principal amortization?: Equal-payment (annuity) maintains a constant monthly payment where interest decreases and principal increases each month. Equal-principal keeps the principal repayment constant, resulting in larger payments initially that decrease steadily over time, saving total interest overall.
How does paying extra principal every month reduce loan costs?: Extra principal payments directly reduce the outstanding balance ahead of schedule. Because interest is calculated on the remaining balance, reducing principal faster significantly lowers cumulative interest and accelerates your payoff date.
Does changing the display currency affect my calculation?: No. The currency selector alters only currency symbols and regional number formatting. No exchange rate conversion is applied to your financial model.