My Brother-in-Law Wants to Buy a Rental in Mexico. Good Idea?

What It Covers

Paula Pant and Joe Saul-Sehy address three listener questions: evaluating a $660,000 Mexico Airbnb purchase for a first-time landlord, managing an IRA that doubled in 18 months at age 66, and whether rolling 401(k)s into IRAs sacrifices lawsuit protection under ERISA federal law.

Key Questions Answered

• •Cap Rate First: Before financing any rental property, calculate net operating income by subtracting vacancies, maintenance, capital expenditures, and management fees from gross revenue, then divide by total acquisition cost. This unleveraged return reveals the underlying asset's strength independent of borrowing, preventing investors from using debt to justify a fundamentally weak investment.
• •International Property Due Diligence: Buying a $660,000 rental in Mexico requires researching landlord-tenant eviction laws, local financing terms and interest rates, property inheritance rules, construction material costs, permitting transparency, and oversupply conditions in that specific location. These governance-level variables directly alter every return calculation and cannot be assumed to mirror U.S. frameworks.
• •Separate Personal Preference from Investment Logic: Buying property in a location you personally enjoy conflates two distinct decisions. Money is fungible — the optimal strategy is to purchase whatever property produces the best risk-adjusted return in any geography, then use that wealth to fund lifestyle choices. Mixing emotional preference with spreadsheet decisions consistently produces suboptimal financial outcomes.
• •401(k) Rollover IRAs Retain ERISA Protection: Money rolled from a 401(k) into a rollover IRA maintains federal ERISA creditor protection, the same near-unlimited shield the 401(k) held. However, that rollover IRA must remain separate — never commingled with regular IRA contributions — to preserve clean legal protection in the event of a lawsuit or creditor claim.
• •Timeline-Based Retirement Allocation: Retirees should match investments to spending timelines rather than asset classes alone. Money not needed for 10-plus years targets capital appreciation via equity ETFs. Nearer-term funds shift toward dividend-producing assets. Moving a substantially grown IRA entirely to cash eliminates inflation-keeping ability, effectively slaying the compounding engine that built the balance in the first place.