Budget Affordability Calculator
See what is left over each month after your regular expenses and a proposed new payment.
Related calculators
Comparing a decision often takes more than one number. Try a linked tool next.
Deciding whether a payment fits
Affordability is not just whether a payment is technically possible — it is whether it leaves you enough room for everything else. This tool subtracts your regular expenses and a proposed new payment from your monthly income to show the buffer that remains. A healthy buffer absorbs the irregular costs that never show up in a tidy monthly budget.
What each input means
- Monthly income is your after-tax take-home pay — the money that actually lands in your account.
- Regular monthly expenses are your recurring costs: housing, utilities, food, transport, minimum debt payments, and subscriptions.
- Proposed new payment is the loan, rent increase, or subscription you are thinking about adding.
What the result tells you
A positive number is the cushion left before irregular expenses and taxes. If it turns negative, the tool shows the shortfall instead of hiding it, which is a clear signal the payment does not fit as-is. Many people aim to keep a meaningful buffer rather than spending down to zero, so a small positive result may still be tighter than it looks.
Because irregular costs — car repairs, medical bills, annual fees — are not included here, treat a slim remaining amount with caution. Adjust the proposed payment to find a level that leaves you comfortable, not just solvent.