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Accounting & BookkeepingTax Preparation & Strategy (new)3MediumAccountant$ implied

Tax accountant cannot determine correct allocation of mortgage interest between schedule A and schedule E for a vacation rental property due to conflicting guidance from software and AI.

Existing tax software and AI do not provide clear, authoritative guidance for complex mortgage interest allocation rules involving vacation rentals, and no reliable source (IRS, Thomson Reuters) is easily at hand.

Opp. Score

Severity

3Medium

Willingness to Pay

implied

Added

May 5, 2026

Workarounds Described

consults AI for guidance but doesn't trust it
uses software that applies rules differently

Implied Software Gaps

Authoritative tax rule database with scenario-based decision trees for ambiguous allocation rules

App Concept

TaxRule Navigator

A decision-support tool for tax professionals that provides step-by-step guidance on complex tax scenarios like mortgage interest allocation for vacation rentals. It integrates authoritative IRS code, revenue rulings, and professional commentary to resolve ambiguous rules.

Key Features

Scenario-based tax flowcharts for mortgage interest allocation
Direct links to IRS publications and revenue rulings
Confidence score for each recommended approach
Exportable memo for client files

Target Users: Tax accountants and enrolled agents in accounting firms handling individual tax returns with rental properties

Revenue Model: $49/mo per user SaaS subscription

Existing Solutions Mentioned

Tax software (unnamed)AI (likely ChatGPT or similar)

Part of App Idea

Tax accountant cannot determine correct allocation of mortgage interest between schedule A and schedule E for a vacation rental property due to conflicting guidance from software and AI.

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