International Tax Calculators
Professional-grade estimation tools for IRS penalties, foreign tax credits, PFIC analysis, and more. Free to use, built by CPAs.
IRS Interest & Penalty Calculator
Estimate IRS underpayment interest, failure-to-file and failure-to-pay penalties with quarter-by-quarter precision.
Estimated Tax Penalty Calculator
Check safe harbor status and estimate underpayment penalties for quarterly estimated tax payments.
FEIE vs FTC Calculator
Compare illustrative U.S. tax outcomes under the Foreign Earned Income Exclusion and Foreign Tax Credit.
Foreign Tax Credit Calculator
Estimate simplified FTC limitation and compare foreign taxes paid to potentially usable credits.
PFIC Tax Impact Calculator
Compare illustrative tax outcomes under the default PFIC regime, mark-to-market, and QEF election.
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Need Professional Help?
These calculators provide estimates. For precise analysis, let our CPAs with 20+ years of experience review your international tax forms or prepare the supporting workpapers.