Interactive tools and calculators for common tax and real estate analyses, plus reference resources for navigating IRS correspondence. Each tool runs entirely in your browser — no information is transmitted, stored, or collected. The tools provide mechanical calculations and general informational guidance based on the inputs provided and the assumptions documented on each tool page. They are not a substitute for professional advice on a specific matter, and the firm strongly recommends professional review of any result before it is acted on.
Look up the IRS notice or letter you have received to learn what it means, the deadline to respond, the consequences of inaction, and whether engaging counsel is typically advisable. Covers Notice of Deficiency (the 90-day letter), Final Notice of Intent to Levy, Federal Tax Lien filings, CP2000 underreporter notices, examination 30-day letters, Trust Fund Recovery Penalty proposals, and other common IRS communications.
Open guide →Multi-year pro forma and tax benefit analyzer for short-term rental investments. Models § 469 material participation eligibility (including the 100-hour test), § 168(k) bonus depreciation under OBBBA, § 461(l) excess business loss limitation (with the 2026 threshold reduction), § 172 NOL carryforward with the 80% limitation, federal and state-level depreciation differences, sale-year § 1245/1250 recapture and capital gain treatment, and after-tax internal rate of return over a user-defined hold period. Includes a credit-score-based mortgage rate estimator and a 50-state conformity table.
Open analyzer →Calculate realized gain, recognized gain (boot), deferred gain, and basis in the replacement property for a like-kind exchange of real estate. Handles cash boot, mortgage relief, and selling expenses.
Open calculator →Calculate the FIRPTA withholding amount due at closing on the sale of a U.S. real property interest by a foreign person, including the personal-residence reduced-rate brackets and the effect of an IRS-issued withholding certificate.
Open calculator →Estimate the federal income tax on a long-term capital gain at the preferential rate brackets (0%, 15%, 20%) plus the 3.8% net investment income tax where applicable. Handles single, married filing jointly, head of household, and married filing separately statuses.
Open calculator →Estimate the first-year tax benefit of a cost segregation study compared to straight-line depreciation, based on building basis, reclassification percentage, applicable bonus depreciation rate, and marginal tax rate.
Open calculator →Estimate the IRS’s Reasonable Collection Potential (RCP) calculation under the offer in compromise rules — the formula the IRS uses to determine the minimum offer amount it will typically accept. Inputs include net realizable equity in assets and disposable monthly income. This is an estimator only, not an eligibility determination.
Open calculator →Disclaimer. The calculators on this site are provided for general informational and illustrative purposes only and do not constitute legal, tax, accounting, or financial advice. The calculators apply simplified assumptions to the inputs provided and are not a substitute for professional analysis of a specific matter. Tax rates, brackets, withholding percentages, and IRS standards change from time to time; calculator outputs may not reflect current law. Use of these calculators does not create an attorney-client relationship with Donovan Legal PLLC or any of its attorneys. Donovan Legal PLLC, 301 W. Atlantic Avenue, Suite 5, Delray Beach, Florida 33444.