CD Calculator

Estimate certificate of deposit earnings and taxes.

Estimate the CD maturity value and after-tax interest.

Result

Maturity balance$11,614.72

Interest earned$1,614.72

Tax on interest$355.24

After-tax balance$11,259.48

Schedule balances are before tax. The marginal tax estimate is applied to positive total interest at maturity; it does not model annual tax cash flows, early withdrawal penalties or changing rates.

Calculation details

Scroll horizontally or vertically to see more. Download CSV for the complete schedule.

Month	Period interest	Cumulative interest	Balance before tax
1	41.67	41.67	10,041.67
2	41.84	83.51	10,083.51
3	42.01	125.52	10,125.52
4	42.19	167.71	10,167.71
5	42.37	210.08	10,210.08
6	42.54	252.62	10,252.62
7	42.72	295.34	10,295.34
8	42.90	338.24	10,338.24
9	43.08	381.31	10,381.31
10	43.26	424.57	10,424.57
11	43.44	468.00	10,468.00
12	43.62	511.62	10,511.62
13	43.80	555.42	10,555.42
14	43.98	599.40	10,599.40
15	44.16	643.56	10,643.56
16	44.35	687.91	10,687.91
17	44.53	732.44	10,732.44
18	44.72	777.16	10,777.16
19	44.90	822.07	10,822.07
20	45.09	867.16	10,867.16
21	45.28	912.44	10,912.44
22	45.47	957.91	10,957.91
23	45.66	1,003.57	11,003.57
24	45.85	1,049.41	11,049.41
25	46.04	1,095.45	11,095.45
26	46.23	1,141.68	11,141.68
27	46.42	1,188.11	11,188.11
28	46.62	1,234.72	11,234.72
29	46.81	1,281.54	11,281.54
30	47.01	1,328.54	11,328.54
31	47.20	1,375.74	11,375.74
32	47.40	1,423.14	11,423.14
33	47.60	1,470.74	11,470.74
34	47.79	1,518.53	11,518.53
35	47.99	1,566.53	11,566.53
36	48.19	1,614.72	11,614.72

How to use this calculator

Estimate the CD maturity value and after-tax interest. Enter amounts in the units shown, select the applicable options, and click Calculate. Use Reset to restore the starting values.

Calculation formula

FV = P × (1 + r/m)^(m×t). Taxes are applied to total interest.

Assumptions and accuracy

Review timing, rates, fees and result notes when comparing scenarios. Future returns and rates are assumptions rather than guaranteed outcomes. Monetary display follows the currency’s precision; intermediate calculations retain additional digits.

Choose what to calculate

CD interest calculator with monthly compounding

Estimate certificate-of-deposit maturity value at the selected compounding frequency. Tax is estimated on positive interest at maturity; early-withdrawal penalties are excluded.

Open this calculation

Understanding this calculation

Estimate CD maturity value with a selected nominal rate, compounding frequency and term. Tax is modeled separately from the pre-tax maturity balance.

Worked examples

A two-year CD with annual compounding

Illustrative inputs are specified in the steps below; the example link loads the complete settings. Unmentioned settings use the linked defaults.

1,000 × 1.10² = 1,210 before any penalties. The example tax rate is zero; the entered rate is an assumption, not a bank quote.

Maturity balance: 1,210 USD.

Try these inputs

Common questions

Should I enter a CD's nominal rate or APY?

The rate is used with the chosen compounding frequency. Do not enter an effective APY as a nominal rate and compound it again.

Is the maturity balance after tax?

Read the separate result labels. The entered tax assumption affects the tax-adjusted result rather than redefining the quoted pre-tax interest.

Scope and assumptions

The model does not quote available CDs or include early-withdrawal penalties, callable features or every tax payment schedule.

Sources

Calculation notes checked October 20, 2026. Examples are mathematical checks under the stated assumptions.

Calculation methods and formulas

CD Return