Post-Retirement Budget Calculator - Build Your Complete Monthly Retirement Budget
The formula: Monthly Surplus = Income Sources - Essential Expenses. A post-retirement budget calculator maps all sources of retirement income against all categories of retirement expenses to produce a monthly surplus or shortfall figure.
The Formula Explained
Monthly Income: Social Security (net of Medicare deduction) + Pension + Portfolio Withdrawal + Annuity Income + Part-Time Income.
Monthly Essential Expenses: Housing + Utilities + Food + Transportation + Healthcare + Income taxes.
Monthly Discretionary Expenses: Dining + Entertainment + Travel + Gifts + Hobbies + Home maintenance reserve.
Worked example (Eleanor, 66): Income: SS net $1,765 + Pension $1,400 + Portfolio withdrawal $2,167 = $5,332/month. Expenses: $2,173 essential + $1,530 discretionary = $3,703. Monthly surplus: $1,629.
How to Use This Calculator on CalcAdvisor.com
Build your retirement budget at https://www.calcadvisor.com/calculators/post-retirement-budget-calculator.
3 Real-World Examples
Example 1: Robert, 68, Single Retiree
Monthly income: $3,365. Monthly expenses: $2,530. Surplus: $835. He directs $400/month to a car replacement sinking fund.
Example 2: Patricia and James, 70 and 67
Monthly income: $8,350. Expenses: $7,080. Surplus: $1,270. When their mortgage eliminates in 10 years, surplus grows to $2,610/month.
Example 3: Diane, 74, Adjusting After Healthcare Costs Spike
Healthcare costs rose from $280 to $945/month - a $665 increase that nearly eliminated her surplus. She increases portfolio withdrawal and reduces travel to rebalance.
Common Mistakes to Avoid
- Using pre-retirement income as the basis for retirement expenses.
- Dramatically underestimating healthcare costs.
- Forgetting to budget for home maintenance and repairs.
- Not accounting for irregular but predictable large expenses.
- Assuming spending will be constant throughout retirement.
- Treating tax as a single annual number rather than a monthly cash flow item.
- Not revisiting and updating the budget annually.
Final Thoughts
Build your complete monthly retirement budget today at https://www.calcadvisor.com/calculators/post-retirement-budget-calculator.