Articles about interest
English-market guides that go deeper than the tool itself — the why, the when, and the cultural context.
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U.S. Retirement Stack 2026: Social Security, 401k, Roth IRA, HSA
Build a $1M retirement nest egg in 30 years. Social Security baseline + 401k max + Roth IRA + HSA stacking strategy. Why HSA is the best-kept retirement secret.
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ARM vs Fixed Mortgage: Lifetime Cap Math and the 5/1 Decision (2026)
5/1 ARM at 6.10% vs 30-year Fixed at 6.85% on a $400K loan. Lifetime cap caps reset at +5%p. When ARM wins, when Fixed protects, and the 5-year sale strategy.
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529, Roth IRA for Kids, UTMA: U.S. Children's Savings Strategies (2026)
529 plans grow tax-free for education. Roth IRA for Kids works if your child has earned income. UTMA gives flexibility but loses tax benefits. The right account for your child's future.
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Refinance Break-Even: When to Pull the Trigger on a New Mortgage
A 0.5% rate drop with $5,000 in closing costs breaks even at month 23 on a $400K loan. The math, the rule of thumb, and when refinancing is wrong even if the rate is lower.
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Nominal vs Real Interest: What Your 5% HYSA Actually Earns After Inflation
5% HYSA APY minus 33% federal+state tax = 3.34% net. Subtract 2.5% inflation = 0.84% real. The math behind why your savings might be losing purchasing power even at 'high' rates.
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Roth IRA, 401k, and HSA: U.S. Tax-Advantaged Accounts in 2026
Max contributions for 2026: Roth IRA $7,000, 401k $23,500, HSA $4,300. The triple-tax-advantaged accounts that can save high earners $10K+ per year. Priority order and limits explained.
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$100K Over 10 Years: Savings vs Stocks Math (Why the Gap Is $130K)
Park $100K in HYSA at 5% for 10 years and you have ~$163K. Invest the same $100K in S&P 500 at 10% historical average — about $260K. The math behind the $97K gap and why time horizon matters.
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Where to Park Your Emergency Fund in 2026 (HYSA, T-Bills, or Money Market)
A 6-month emergency fund of $30,000 sitting at 0.01% interest loses $1,500 a year vs HYSA. The right home for emergency cash: HYSA, T-Bills, or money market funds — and when to use each.
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30Y vs 15Y Mortgage: When the Shorter Loan Actually Wins
On a $400K mortgage, a 15-year fixed costs ~$750 more per month than a 30-year and saves ~$335K in lifetime interest. The real decision is not the rate — it's the cash-flow risk.
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Your $100K HYSA Math, After Federal and State Tax (2026)
A 5% APY HYSA headline looks great until your federal bracket and state tax pull the real number down. Here is the after-tax math for $100K parked one year — TX vs CA, HYSA vs T-bill.