💍 Couples Finance Tool
Income Merger Simulator
Two incomes, one optimized plan. Enter your numbers and your partner's — see your optimal tax filing strategy, retirement allocation, and household budget split.
👤 Partner Details
Partner A
Partner B
📋 Tax Filing Strategy
Which filing status saves you more — and exactly how much.
Married Filing Jointly
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VS
Filing Separately
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Estimated Annual Tax Savings
$0
📈 Retirement Allocation
How to split retirement contributions between partners for maximum growth.
💰 Budget Split
Three approaches to splitting household expenses — pick what fits your relationship.
📊 Proportional
⚖️ 50/50
🔀 Yours-Mine-Ours
🎯 Combined Household Snapshot
Your merged financial picture at a glance.
💍 Take the Money Compatibility Quiz
Numbers are half the equation. Take the Money Compatibility Score quiz together to see how aligned your financial values, risk tolerance, and spending philosophies really are.
Take the Quiz Together →
🏗️ Build Your Joint Wealth Blueprint
Use the Wealth Blueprint to create a 9-phase roadmap for your combined financial future — from emergency fund through legacy planning.
Start Your Blueprint →
❓ Frequently Asked Questions
When should couples file separately instead of jointly?
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Filing separately makes sense in a few specific situations: when one partner has significant medical expenses (the 7.5% AGI floor is lower on a single income), when one has student loans on an income-driven repayment plan (filing jointly would increase the payment), when one has tax liabilities or back taxes the other doesn't want to be responsible for, or when one has significant miscellaneous deductions. For most couples, though, filing jointly produces a lower total tax bill because the brackets are wider and more credits are available.
Should both partners max out their 401(k)?
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Ideally yes, but the order matters. The priority should be: (1) both partners contribute enough to get the full employer match — this is free money, (2) max out any available HSA, (3) increase the contribution of whichever partner has the higher marginal tax rate first, since the tax savings are greater. If you can't max both, the higher-income partner usually benefits more from additional 401(k) contributions because each dollar sheltered saves more in taxes.
What's the best way to split expenses as a couple?
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There's no single right answer — it depends on your incomes, values, and relationship dynamics. Proportional splitting (each pays a percentage of shared costs equal to their percentage of combined income) is the most mathematically fair when there's a significant income gap. Equal splitting works well when incomes are similar. The "yours-mine-ours" model (joint account for shared expenses, separate accounts for personal spending) gives both partners autonomy while ensuring bills get paid. The best approach is the one you both feel good about and can sustain.
How does marriage affect student loan repayment?
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If either partner has federal student loans on an income-driven repayment plan (IBR, PAYE, REPAYE/SAVE), filing jointly means both incomes count toward the payment calculation — often increasing the monthly payment significantly. Filing separately can keep payments lower but you may lose other tax benefits. This is one of the most common reasons couples choose to file separately. Our tool factors this in when comparing filing strategies.
Is this tool's data saved or shared?
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No. Everything runs in your browser. We don't collect, save, or transmit any of the financial information you enter. When you close or refresh the page, it's gone. DigitalWealthSource has no accounts, no logins, and no data storage.