Pension Income Calculator

Enter the monthly pension amount, expected monthly Social Security, retirement account balance, withdrawal rate, any other monthly income, and monthly expenses. Use a consistent time basis: pension and Social Security should be monthly figures, while the savings balance is an account value. The calculator converts the balance and withdrawal rate into monthly withdrawals.

The tax-rate input is a flat percentage applied to all modeled income. Actual tax treatment differs by income source and may depend on filing status, deductions, state, and other income. The inflation rate increases Social Security, account withdrawals, other income, and expenses in the projection; the pension COLA separately increases pension payments.

For a more detailed spending plan, compare a monthly retirement income calculator or an overall retirement income calculator. For a budget-based estimate, see what is a good retirement income?.

First, the calculator converts the retirement balance into annual and monthly withdrawals:

Annual withdrawals = retirement balance × withdrawal rate
$500,000 × 0.04 = $20,000

Monthly withdrawals = annual withdrawals / 12
$20,000 / 12 = $1,666.67

It adds the monthly pension, Social Security, and withdrawals:

Gross monthly income = pension + Social Security + monthly withdrawals + other income
$2,500 + $1,800 + $1,666.67 + $0 = $5,966.67

The entered tax rate is 22%, so the calculator retains 78% of gross income:

Estimated net monthly income = gross monthly income × (1 − tax rate)
$5,966.67 × (1 − 0.22) = $4,654

Then it subtracts monthly expenses:

Monthly surplus or shortfall = estimated net monthly income − expenses
$4,654 − $5,000 = −$346

The negative result means the modeled income falls short of the entered expenses by $346 each month. The income replacement ratio is net monthly income divided by expenses: $4,654 ÷ $5,000 × 100 = 93.08%.

The calculator projects 31 data points, including the first projection year and the point 30 years later. At the first point, the estimates are $55,848 in net income and $60,000 in expenses for the year. Those figures correspond to $4,654 and $5,000 per month multiplied by 12.

At the final projection point, the calculator estimates $121,146 in net income and $145,636 in expenses. These are future nominal dollars under the supplied assumptions. They are not directly comparable with today’s $4,654 monthly income without accounting for purchasing power.

The model increases pension payments by the pension COLA, while it increases Social Security, withdrawals, other income, and expenses using the general inflation assumption. In the default case, inflation is 3% and the pension COLA is 2%. This means the pension grows more slowly than modeled expenses, so its purchasing power declines relative to expenses over time.

A separate Social Security estimate can be built with a Social Security calculator. For non-pension sources, compare a dividend income retirement calculator or a rental income retirement calculator. The calculator does not check whether a 4% withdrawal can sustain the balance for the full projection period.

The table uses the default income inputs, so estimated net monthly income remains $4,654 unless the withdrawal rate changes. Changing monthly expenses changes the surplus directly; changing the withdrawal rate changes the income estimate but also the amount drawn from savings.

At a 3% withdrawal rate, annual withdrawals fall from $20,000 to $15,000, or from $1,666.67 to $1,250 per month. After the 22% tax assumption, monthly income declines by $325, producing a $671 shortfall at $5,000 of expenses. This example shows the tradeoff: a lower withdrawal supports a smaller current income estimate but leaves more in the account.

If the gap is persistent, test the budget, other income, and savings withdrawal separately. A retirement goal calculator can help frame a savings target, while a pension drawdown calculator models how long withdrawals may last. For tax-focused context, see a provisional income calculator.

Annual account withdrawal = retirement balance × withdrawal rate
Monthly account withdrawal = annual account withdrawal / 12

Gross monthly income = pension + Social Security + monthly withdrawals + other income
Estimated net monthly income = gross monthly income × (1 − assumed tax rate)

Monthly surplus or shortfall = estimated net monthly income − monthly expenses
Income replacement ratio = estimated net monthly income / monthly expenses × 100

For the projection, pension income grows by the pension COLA, while Social Security, withdrawals, other income, and expenses grow by the general inflation rate. The calculator applies the same entered tax percentage to the modeled sources. These simplifications make the result useful for comparing assumptions, but they can differ from actual tax treatment and account behavior.

The calculator’s tax rate is not a statutory tax bracket. It applies the same percentage to pension, Social Security, and account withdrawals, even though those sources may be taxed differently. Social Security benefits can be partly taxable depending on a taxpayer’s other income, while qualified Roth withdrawals may be tax-free and traditional retirement-account withdrawals are generally taxable as ordinary income. The IRS explains benefit taxation at Taxation of Social Security Benefits.

State taxation also varies. Use a pension tax by state calculator as a starting point, then check current state rules. For a broader overview of how withdrawals are taxed, consult required minimum distributions explained.

A pension COLA is not always equal to inflation, and some pensions have no COLA or cap annual increases. If the plan’s adjustment differs from the entered amount, the long-term projection may materially overstate or understate pension buying power. Social Security benefit increases also follow a specific cost-of-living adjustment process; they are not set by the pension COLA field.

Does the $4,654 result mean I will receive exactly that much after tax?

No. It is the calculator’s estimate after applying a flat 22% reduction to all modeled income. Actual net income depends on income source, account type, deductions, filing status, and state taxes.

Why does the calculator show a shortfall if gross income is almost $6,000?

Because the calculator subtracts the assumed 22% tax from gross income before comparing income with expenses. The estimated $4,654 net income is $346 below the $5,000 monthly expense input.

Should I raise my withdrawal rate to close the monthly gap?

A higher withdrawal rate can increase current modeled income, but it also draws more from savings and may shorten the time the account lasts. Compare both the income result and a drawdown projection using a pension drawdown calculator.

Does the calculator test whether my account lasts for 30 years?

No. It projects income and expenses over 30 years but does not reduce the retirement balance as withdrawals occur. A separate drawdown model is needed to estimate depletion.

Is pension COLA the same as inflation?

No. COLA is the plan’s adjustment to pension payments, if any. Inflation measures changes in prices. If the pension COLA is lower than inflation, the pension may buy less over time.

Should I use current or future dollars for expenses?

Use current monthly expenses for the calculator’s starting comparison. The projection then increases expenses by the inflation assumption. Include recurring costs such as housing, food, transportation, and healthcare in a consistent monthly amount.

Check pension and Social Security statements for reliable starting amounts, then build a realistic expense budget. Test more than one inflation rate, pension COLA, tax estimate, and withdrawal rate. If you have a persistent gap, compare spending adjustments with other income options such as deferred income annuities or REIT income. The calculator is most useful as a scenario tool—not a promise of future after-tax cash flow.