People don't understand the tax implications of retirement account moves until after they've made irreversible decisions—a $100k+ rollover into the wrong account type means a massive unexpected tax bill.
Users input their current income, account balances, and proposed transaction. The tool calculates exact federal and state tax impact, compares scenarios (e.g., Roth conversion vs. Traditional rollover), and shows the optimal path. Integrates with common brokerage account data via Plaid.
Subscription: $9.99/month or $79/year for individuals; $299/year for financial advisors with client management features.
The pain is real and expensive — a botched Roth conversion or rollover can cost $10k-$50k+ in unexpected taxes and is literally irreversible. The Reddit thread shows people discovering this AFTER the fact. However, it's episodic pain (happens a few times in a lifetime, not daily), which limits urgency.
~60M Americans have 401k accounts, ~35M have IRAs. But the addressable market for a paid simulator is narrower: people actively making a rollover/conversion decision AND willing to pay for a tool AND not already using an advisor. Realistic TAM for individual subscriptions is probably $50-100M. Advisor tier expands this significantly.
This is the weak spot. $9.99/month for something you need 1-3 times in your life is a hard sell — most people will use it for one month and cancel. The pain is high but infrequent. Free brokerage calculators and Reddit advice are 'good enough' for many. Advisor tier at $299/year has better retention logic but competes with Holistiplan. Annual pricing at $79 will see massive churn.
Federal tax brackets are straightforward, but accurate tax simulation is surprisingly complex: state taxes across 50 states, AMT, NIIT, IRMAA, pro-rata rules, Social Security taxation thresholds, ACA subsidy cliffs, required minimum distributions, and annual tax law changes. Plaid integration adds weeks. A solo dev can build a useful MVP in 6-8 weeks, but 'exact dollar consequences' as promised requires deep tax domain expertise. Getting it wrong destroys trust instantly.
Clear gap exists: no tool is purpose-built for real-time, pre-transaction tax simulation of specific retirement account moves with both federal and state accuracy. Boldin is closest but is a full retirement planner. Holistiplan is advisor-only. Brokerage tools are too basic. The gap is real — but the question is whether it's a product or a feature.
This is the critical weakness. Retirement account transactions are episodic — most people do a rollover or conversion 1-5 times total. Monthly subscription makes no sense for consumers. Even annual is hard to justify after the initial decision is made. Advisor tier has better recurring potential since they handle multiple clients, but the consumer subscription model will see 80%+ annual churn.
- +Genuine, expensive pain point with irreversible consequences — strong emotional driver
- +Clear competitive gap — nothing purpose-built exists for this exact use case
- +Advisor tier provides a viable B2B angle with real recurring revenue potential
- +Growing market with massive demographic tailwinds (Boomer retirement wave)
- +High trust ceiling — if accuracy is proven, word-of-mouth in FIRE/PF communities would be strong
- !Consumer subscription model is fundamentally flawed for an episodic need — expect severe churn
- !Tax accuracy liability: one wrong calculation and you face lawsuits or destroyed reputation. Need disclaimers AND precision.
- !Brokerage platforms could build this as a feature overnight — it's a feature, not obviously a company
- !Tax law changes annually — ongoing maintenance burden is significant and unglamorous
- !Plaid integration for retirement accounts has spotty coverage and auth friction that kills conversion
Comprehensive retirement planning platform with Roth conversion explorer, tax-aware withdrawal strategies, and scenario comparison tools. Lets users model different retirement account moves and see projected tax impact over time.
AI-powered tax planning software for financial advisors. Uploads client tax returns and generates tax planning reports including Roth conversion analysis and income projection scenarios.
Major brokerages offer basic Roth conversion calculators and rollover guidance tools within their platforms. Fidelity's Roth Conversion Calculator and Schwab's rollover tools are the most commonly used.
Spreadsheet-based
Tax prep software includes what-if scenario tools that let you see how adding income
Skip Plaid integration for MVP. Build a clean, single-page web app where users manually input: filing status, income, state, current account type/balance, and proposed transaction. Output a side-by-side comparison of 2-3 scenarios (e.g., Roth conversion vs. Traditional rollover vs. do nothing) showing exact federal + state tax delta. Cover the top 10 states first. Charge per-simulation ($4.99-$14.99 one-time) instead of subscription. Add a 'share with advisor' PDF export. Validate with r/personalfinance and Bogleheads communities.
Free basic calculator (single scenario, federal only) → Paid per-simulation ($4.99-14.99 for multi-scenario + state taxes + PDF report) → Advisor Pro annual license ($299/year for client management, white-label reports, batch scenarios) → Enterprise/API for fintech platforms and robo-advisors embedding tax simulation
8-12 weeks to MVP with manual input and top 10 states. First revenue possible at week 10 via pay-per-simulation or lifetime access deals in FIRE communities. Advisor tier adds 4-6 weeks. Meaningful revenue ($5k+ MRR) likely takes 6-9 months given the niche audience and trust-building required.
- “rolled over an old 401k with over 100k in it”
- “would have to pay taxes on it”
- “you're on the hook for the taxes regardless and it can't be undone”
- “If you underestimate your taxable income for the year”