What's the best tax estimator for estimating refund or balance due with current-year federal and state rules?

There isn’t one universally “best” tax estimator, because the best choice depends on whether you want:

• a quick paycheck/refund estimate
• a more accurate full-return estimate
• federal only vs. federal + state
• W-2 only vs. self-employed, investments, crypto, rental, etc.

That said, here are the strongest options for current-year federal and state estimates:

Best overall for most people

TurboTax TaxCaster / TurboTax estimator

• Good for refund or balance-due estimates
• Usually supports federal + state
• Solid for W-2, dependents, basic credits, itemizing
• Easy to use, but can get limited for more complex situations

Best free quick estimate

IRS Tax Withholding Estimator

• Best for federal withholding planning
• Very useful if you want to avoid a surprise refund or balance due
• Excellent for adjusting W-4s
• Does not cover state taxes

Best for more accurate full-return planning

H&R Block Tax Calculator / estimator

• Often better than simple paycheck calculators for full tax picture
• Can handle federal + many state rules
• Good if you want a consumer-friendly estimator and may file with them later

Best for state-specific accuracy

Your state revenue department’s withholding calculator/estimate

• If your state has a strong estimator, it can be the most accurate for that state
• Especially useful in states with unusual deductions, credits, or brackets

Best for self-employed / complex situations

A full tax prep platform estimator such as:

• TaxSlayer
• H&R Block
• TurboTax
• FreeTaxUSA (good value, but estimator features may be less polished)

These are better if you have:

• self-employment income
• multiple W-2s
• investments
• itemized deductions
• dependent care credits
• rental income

Practical recommendation

If you want one answer:

• Federal withholding / paycheck planning: IRS Tax Withholding Estimator
• Refund or balance-due estimate including state: TurboTax TaxCaster or H&R Block estimator
• Most accurate for your state: your state’s official estimator, if available

What to watch out for

Most estimators can be off if they don’t fully capture:

• bonus withholding
• self-employment tax
• state local taxes
• capital gains/dividends
• ACA health insurance credits
• retirement contributions
• estimated tax payments already made

If you want, I can recommend the best estimator for your exact situation if you tell me:

1. your state,
2. W-2 vs self-employed,
3. whether you want refund estimate or withholding check,
4. filing status and any major deductions/credits.