Divorce Financial Impact Calculator
Estimate the financial impact of divorce: how your monthly budget, housing costs, and disposable income change when splitting a household. Includes asset division, alimony, and child support.
About this calculator
Divorce almost always makes household costs go up per person, because two people stop sharing economies of scale. This calculator models that directly: your current cost-per-person assumes your existing mortgage/rent and shared expenses are split evenly between two people, while your post-divorce outflow assumes you alone pay your new (typically higher) rent plus 70% of what the old shared expenses used to cost — a fixed assumption representing that most recurring bills don't shrink proportionally just because one person moved out. Child support and alimony are added as signed monthly amounts (positive if you pay them, negative if you receive them) directly into that post-divorce outflow.
Assets and debts are split 50/50 by default, and the difference between your share of savings and your share of debt is your "net assets after split." The first-year cost estimate combines your one-time legal fees with twelve months of any housing cost increase, plus twelve months of any drop in monthly disposable income — capturing both the immediate legal bill and the ongoing squeeze. Because every split here defaults to a straight 50/50 assumption, treat every dollar figure as a rough starting point for a conversation with an attorney, not a number to plan a settlement around — real divorces frequently split assets and debts unevenly based on state law (community property vs. equitable distribution), prenup terms, and negotiation. Common mixups: enter your alimony/child support as negative if you're the one receiving payments, not paying them, or the surplus and gap figures will run backwards.
Financial Disclaimer
This calculator is for educational purposes only and does not constitute financial advice. Results are estimates based on the inputs provided. Consult a qualified financial advisor before making investment or financial planning decisions.
Inputs
Results
Post-Divorce Monthly Surplus
$2,500.00
Disposable Income Change
-$800.00
How to Use This Calculator
- Enter the couple combined assets (home equity, retirement, investments, vehicles).
- Set each partner individual income and monthly expenses.
- Input shared debts (mortgage balance, loans, credit cards).
- Review estimated asset split and each partner projected monthly budget post-divorce.
- Use the net worth impact to evaluate settlement negotiation positions.
How the result changes with Your Monthly Income ($)
| Your Monthly Income ($) | Post-Divorce Monthly Surplus | Disposable Income Change |
|---|---|---|
| 2,750 | -$250.00 | -$800.00 |
| 4,125 | $1,125.00 | -$800.00 |
| 8,250 | $5,250.00 | -$800.00 |
| 13,750 | $10,750.00 | -$800.00 |
What each input means
- Combined Household Income ($/mo)
- Total monthly take-home pay for both partners.
- Your Monthly Income ($)
- Your individual monthly take-home pay.
- Current Mortgage/Rent ($)
- Current monthly housing payment shared between you.
- Shared Monthly Expenses ($)
- Utilities, groceries, subscriptions, and other shared costs.
- Total Joint Savings ($)
- Combined savings, investments, and retirement accounts to be divided.
- Total Joint Debt ($)
- Combined debts (credit cards, loans) to be divided.
- Your Estimated New Rent ($)
- What you expect to pay for housing on your own.
- Estimated Legal Costs ($)
- Attorney fees, filing fees, mediation costs. Average uncontested: $5-7K; contested: $15-30K.
- Child Support ($/mo)
- Positive if you pay, negative if you receive.
What each result means
- Post-Divorce Monthly Surplus
- Your remaining income after all post-divorce expenses. Negative means deficit.
- Post-Divorce Monthly Expenses
- Total monthly outflow including housing, expenses, support payments.
- Disposable Income Change
- How much your monthly disposable income changes. Negative = less spending power.
- Housing Cost Change
- How much more (or less) you pay for housing alone vs splitting.
- Your Share of Savings
- Your half of joint savings and investments.
- Your Share of Debt
- Your half of joint debt obligations.
- Net Assets After Split
- Your savings share minus your debt share.
- Estimated First Year Cost
- Total first-year financial impact including legal costs and increased expenses.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersCombined Household Income ($/mo) = 10000, Your Monthly Income ($) = 5500, Current Mortgage/Rent ($) = 2400, Shared Monthly Expenses ($) = 2000 = 10 input(s) provided
- Calculate Post-Divorce Monthly SurplusPost-Divorce Monthly Surplus = yourIncome - postDivorceMonthlyOutflow2500 = $2,500
- Calculate Disposable Income ChangeDisposable Income Change = postDivorceSurplus - currentDisposable-800 = $-800
- Calculate Post-Divorce Monthly ExpensesPost-Divorce Monthly Expenses = postDivorceFixedCosts + netChildSupport + netAlimony3000 = $3,000
- Calculate Housing Cost ChangeHousing Cost Change = estimatedNewRent - currentMortgageRent / 2400 = $400
Engine last updated . Checked against 3 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why does the calculator assume I'll still pay 70% of the old shared expenses alone?
The 70% figure (postDivorceFixedCosts = estimatedNewRent + sharedMonthlyExpenses * 0.7) models the fact that most recurring household bills — insurance, subscriptions, a chunk of utilities and groceries — don't shrink proportionally just because one person moved out. It's a fixed planning assumption built into the formula, not something tied to your specific bills, so treat it as a rough approximation rather than an exact prediction of your post-divorce budget.
I'm receiving alimony or child support, not paying it — how do I enter that?
Enter it as a negative number. The calculator treats Child Support and Alimony as signed values added directly into your post-divorce monthly outflow — a positive number increases what you owe each month, while a negative number reduces it, correctly modeling money coming in rather than going out. Entering a payment you receive as positive will make your projected surplus look far worse than it actually is.
How is the 'Estimated First Year Cost' different from my Post-Divorce Monthly Surplus?
Post-Divorce Monthly Surplus is an ongoing monthly snapshot (your income minus your new monthly outflow), while Estimated First Year Cost is a one-time total for year one specifically: your legal fees, plus twelve months of any increase in housing cost, plus twelve months of any drop in disposable income if your new surplus is lower than your old one. In other words, the first-year figure captures the upfront hit on top of the new steady-state budget the monthly surplus describes.
Does Combined Household Income affect any of the results?
No -- none of the figures below draw on Combined Household Income at all. Your Monthly Income and the other individual line items you enter are what drive every output here; the couple's combined total plays no part in the math.
Why does my Net Assets figure not match what I expect from our actual settlement?
Net Assets After Split assumes joint savings and joint debt are both divided exactly 50/50 (yourShareSavings minus yourShareDebt, each simply half the total you entered). Real settlements often split assets unevenly based on state law, a prenup, or negotiation, so this figure is only a starting reference point — an actual settlement could reasonably shift meaningfully in either direction from this 50/50 baseline.
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