Comprehensive Guide
Learn more in our Comparison Guide.
How it works
The DIY-versus-preparer question is an arithmetic problem with one honest unknown. The arithmetic: filing yourself costs the software price plus the hours it takes you, valued at what your time is worth. Hiring a preparer costs their fee minus any tax they save you by finding deductions you would have missed. This tool puts both on one scale. The unknown is that last figure — the deductions a professional would catch that you would not. For a simple W-2 return with a standard deduction, that number is close to zero, because there is little to find and software handles it correctly. For a return with rental property, a side business, equity compensation or multiple states, it can be large, because those are precisely the situations where software silently applies the wrong treatment and a competent preparer does not. The break-even deductions line makes it concrete: how much a pro must find to justify their fee at your marginal rate. If they need to find $2,000 of deductions and your return has no $2,000 of deductions to find, file it yourself. The complexity selector applies the judgement the numbers cannot — at the complex end, a preparer usually pays for themselves not through extra deductions but through not getting the return wrong, which is worth more than any single deduction.Formula
DIY = software + hours x hourly value | Preparer = fee - (deductions found x marginal rate) | Break-even = fee gap / marginal rate
Tips
- Simple W-2 returns with the standard deduction: file yourself. There is nothing for a preparer to find.
- Complex returns — business, rental, equity comp, multi-state — are where preparers earn the fee by not getting it wrong.
- Count the full software price, including the state filing and the tier upgrades the interview pushes you into.
- Value your time honestly, but remember it is not cash — unpaid leisure hours weigh less than the software price.
- A preparer who guarantees a bigger refund before seeing your documents is selling, not advising.
Frequently asked questions
Should I file my own taxes or hire a preparer?
File yourself if your return is simple — a W-2, the standard deduction, maybe an HSA or a credit. Hire a preparer if you have a business, rental property, equity compensation, a multi-state situation, or a major life change, because those are where software quietly gets the treatment wrong.
Is a tax preparer worth the cost?
When they find deductions you would miss or prevent an error that would cost more than their fee. At a 22% marginal rate, a $450 fee is justified if they find about $2,000 of deductions or save you from one meaningful mistake. On a simple return, neither exists and the fee buys only your time back.
How much does tax software cost compared to a CPA?
Software runs from free to around $200 for most filers, plus state and upgrade tiers. A preparer typically charges $250 to $600 for a straightforward return and far more for complex ones. The real comparison adds your time to the software side and subtracts tax saved from the preparer side.
When is DIY tax filing a mistake?
When the return involves a business, rental income, stock compensation, a home sale, multiple states, or a major life event like marriage, divorce or an inheritance. Those carry elections and treatments that software interviews handle poorly and a professional handles routinely.
Do tax preparers get you a bigger refund?
Sometimes, by finding legitimate deductions and credits you missed — but a refund is just your own overpaid tax returned, and a preparer who promises a bigger one sight-unseen is a warning sign. The honest value is accuracy and deductions found, not a magically larger cheque.