What if payment does not cover interest?

The calculator reports that the debt cannot be repaid with that payment.

Is this a debt strategy recommendation?

No. It only estimates one balance under the entered terms.

Debt Payoff Calculator

Estimate debt payoff time, interest, and extra-payment savings.

Estimated payoff time

47 months

Total interest: $3,967.21
Total paid: $13,967.21
Monthly payment: $300.00

What-if comparison

Required payment only: 47 months
Months saved: 0
Interest saved: $0.00

Balance over time

Payment schedule
Payment	Amount	Principal	Interest	Balance
1	$300.00	$150.00	$150.00	$9,850.00
2	$300.00	$152.25	$147.75	$9,697.75
3	$300.00	$154.53	$145.47	$9,543.22
4	$300.00	$156.85	$143.15	$9,386.36
5	$300.00	$159.20	$140.80	$9,227.16
6	$300.00	$161.59	$138.41	$9,065.57
7	$300.00	$164.02	$135.98	$8,901.55
8	$300.00	$166.48	$133.52	$8,735.07
9	$300.00	$168.97	$131.03	$8,566.10
10	$300.00	$171.51	$128.49	$8,394.59
11	$300.00	$174.08	$125.92	$8,220.51
12	$300.00	$176.69	$123.31	$8,043.82
13	$300.00	$179.34	$120.66	$7,864.48
14	$300.00	$182.03	$117.97	$7,682.44
15	$300.00	$184.76	$115.24	$7,497.68
16	$300.00	$187.53	$112.47	$7,310.14
17	$300.00	$190.35	$109.65	$7,119.80
18	$300.00	$193.20	$106.80	$6,926.59
19	$300.00	$196.10	$103.90	$6,730.49
20	$300.00	$199.04	$100.96	$6,531.45
21	$300.00	$202.03	$97.97	$6,329.42
22	$300.00	$205.06	$94.94	$6,124.36
23	$300.00	$208.13	$91.87	$5,916.23
24	$300.00	$211.26	$88.74	$5,704.97
25	$300.00	$214.43	$85.57	$5,490.55
26	$300.00	$217.64	$82.36	$5,272.90
27	$300.00	$220.91	$79.09	$5,052.00
28	$300.00	$224.22	$75.78	$4,827.78
29	$300.00	$227.58	$72.42	$4,600.19
30	$300.00	$231.00	$69.00	$4,369.20
31	$300.00	$234.46	$65.54	$4,134.74
32	$300.00	$237.98	$62.02	$3,896.76
33	$300.00	$241.55	$58.45	$3,655.21
34	$300.00	$245.17	$54.83	$3,410.04
35	$300.00	$248.85	$51.15	$3,161.19
36	$300.00	$252.58	$47.42	$2,908.60
37	$300.00	$256.37	$43.63	$2,652.23
38	$300.00	$260.22	$39.78	$2,392.02
39	$300.00	$264.12	$35.88	$2,127.90
40	$300.00	$268.08	$31.92	$1,859.82
41	$300.00	$272.10	$27.90	$1,587.71
42	$300.00	$276.18	$23.82	$1,311.53
43	$300.00	$280.33	$19.67	$1,031.20
44	$300.00	$284.53	$15.47	$746.67
45	$300.00	$288.80	$11.20	$457.87
46	$300.00	$293.13	$6.87	$164.74
47	$167.21	$164.74	$2.47	$0.00

Results are estimates for informational purposes only and are not financial advice.

What this calculator does

Model one debt balance with a required payment and optional extra monthly amount.

Inputs and what they mean

Debt balance: — number value.
APR: — number value.
Required monthly payment: — number value.
Extra monthly payment: — number value.

How to use it

Enter the values for your estimate.
Adjust the rate, duration, and optional scenario inputs.
Review the totals, comparison, chart, and schedule where available.

Formula

Each month, interest equals balance × APR ÷ 12. Payment covers interest first and the remainder reduces principal.

Worked example

$10,000 debt at 18%

Compare a $300 required payment with an extra monthly payment.

Reading the result

The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.