Complex financial decisions, made clearer.
DueMATH gives you a fast estimate for inheritance tax, 401(k) rollovers, student loan refinancing, gig-worker quarterly taxes, and federal estate tax — with the methodology, sources, and next steps shown alongside every number, not just the number.
- No account required
- 100% local calculation
- Source verified
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Inheritance Tax Calculator
Find out what you'll owe on an inheritance in Kentucky, Maryland, Nebraska, New Jersey, or Pennsylvania in about 60 seconds.
Estate Tax Calculator
Estimate federal and state estate tax exposure before you file, based on the 2026 $15M federal exemption.
401(k) Rollover Calculator
Compare rolling your old 401(k) into an IRA, a new employer plan, or cashing out — and see the tax hit each way.
Student Loan Refinance Calculator
See how much refinancing your student loans could save you in interest and monthly payment.
Gig Worker Tax Calculator
Estimate quarterly self-employment tax on 1099 income from Uber, DoorDash, freelancing, and more.
How it works
Step 1
Calculate
Answer a few plain-English questions. No account, no spreadsheet.
Step 2
Compare
See how different states, timing, or account types change your number.
Step 3
Act
Get a concrete next-step plan, not just a number on a screen.
Why trust these numbers
No testimonials here — instead, the actual things that determine whether a number is trustworthy.
Sources and assumptions disclosed
Every calculator documents where its numbers come from and when they were last checked — not one global badge implying every figure is equally verified.
No account, and your inputs stay local
Calculations run in your browser. Nothing you type is sent anywhere unless you use the optional AI explanation feature — see the Privacy Policy for exactly what that sends.
Limitations stated up front
Where a figure is an approximation rather than a primary-source-verified number, the calculator says so with an "Estimated" badge — not buried in fine print.
Frequently asked questions
Is DueMATH's inheritance tax calculator accurate?
It's built from published state tax guidance and reviewed periodically, but tax law changes and every estate is different. Treat every result as an estimate and confirm anything material with a CPA or estate attorney before filing.
Which states have an inheritance tax in 2026?
Kentucky, Maryland, Nebraska, New Jersey, and Pennsylvania. Iowa repealed its inheritance tax effective January 1, 2025. Most states have no inheritance tax at all — it's different from the federal or state estate tax.
Is DueMATH free to use?
Yes. Every calculator on DueMATH is free, with no account required.