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Streaming and SaaS prices have been climbing well above general inflation since the post-subscriber-growth phase began around 2022. We projected what a 6-12%/year hike rate compounds to.

A 2-year cycle buys five devices over a decade and sells four; a 4-year cycle buys three and sells two. Higher resale value on newer trade-ins doesn't fully offset the extra purchases.

The pattern repeats across every cloud provider: upgrade once when storage feels tight, then never re-check as old files get cleared out. We ran the actual cost-per-used-GB math.

The original cord-cutting math worked exactly once, when Netflix alone cost $9. We checked what re-fragmentation across Disney+, HBO Max, and sports add-ons actually did to the household total.

Every individual subscription feels small. That's exactly why almost nobody adds them up. We checked what $50/month actually becomes over 30 years once you count the invested-instead alternative.

The safe harbor rule means you don't have to accurately estimate this year's tax at all — just match a defined floor based on last year's numbers, and the penalty doesn't apply no matter what you actually owe in April.

A Roth conversion ladder converts traditional IRA funds to Roth during a low-income year, betting your future marginal rate will be higher than today's. The classic case: the gap years between early retirement and Social Security.

W-2 employees never see the employer half of FICA tax; it's withheld before the paycheck prints. 1099 workers owe both halves themselves, and it routinely blindsides first-year freelancers.

Tax-loss harvesting is well known. Tax-gain harvesting is the less-famous mirror move — and it's arguably more valuable in a genuinely low-income year.

The 'bracket bump' fear — that a raise could leave you worse off — is mathematically wrong for federal income tax. We walked a $75,000 earner through exactly why.

Edleson's Value Averaging always hits the target. The honest question is what it costs you to get there. We ran six real historical windows — Lost Decade, Post-GFC Bull, dotcom crash — through the calculator. VA's edge is real. So is its $75K-month cash drag.

$1.95M for US retirement vs $1.0M for Lisbon. Same lifestyle, half the savings target. The COL × healthcare double-discount that makes 'retire abroad' the highest-leverage FIRE move tech workers don't take.

Three options, three answers depending on duration. Sublet wins for 3-6 month trips with strong recovery; lease break wins past 9 months; keep-empty almost never wins. The math, the legality wildcards, and the re-entry trap.

Most sabbatical calculators show cash drawdown and stop. The honest math is 15× higher because foregone earnings compound to retirement. We modeled four common scenarios — three are cheaper than you think; one creates a NET positive lifetime impact.

FEIE excludes $130K of foreign income from US federal tax — but the 330-day Physical Presence rule is binary. Miss by even 1 day and you owe full federal tax on the entire amount. The math, the trap, and the workarounds people don't talk about.