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The loan officer slid the stack of papers across the desk, tapped the last page, and said, "Sign here and we can release the funds today."
I wanted to. The car repair had already eaten my savings, I was tired, and the paperwork looked like a wall of legal text nobody expected me to read. That's exactly why I stopped. Everything about that moment was built to make me sign quickly.
Most people borrow when they're under pressure: a medical bill, a failed transmission, a late invoice from a supplier. Pressure makes you skim. Lenders know this, and a few of them rely on it. Not every lender is predatory, but every lender is a business, and the contract is written to protect the business first.
This guide covers the seven mistakes I see most often, with real numbers, plus a short process you can follow before signing anything.

1. Choosing a loan by its monthly payment
"It's only $300 a month" is the easiest sentence in lending to say and the hardest to evaluate. A monthly payment tells you whether you can fit the loan into your budget. It tells you nothing about what the loan costs.
Lenders lower the payment by stretching the term. Take a $20,000 kitchen renovation loan:
Loan B saves $250 a month and costs $3,600 more. That's the price of the lower payment.
What to do: Ask every lender for the payment at two different terms, then multiply payment by number of months and subtract the amount borrowed. That number is your real interest cost. If you can handle the shorter term's payment, take it.
2. Mixing up the interest rate and the APR
The interest rate is the price of the money. The APR (annual percentage rate) is the price of the money plus the fees required to get it, expressed as a yearly rate. Two loans with the same interest rate can have very different APRs.
An example. You borrow $10,000 for 36 months at 9% with a 5% origination fee:
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Monthly payment: about $318
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Cash you actually receive: $9,500 (the $500 fee is taken upfront)
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Effective APR: roughly 12.5%
So a loan advertised at 9% really costs closer to 12.5%. Always compare APR to APR. If the gap between a lender's rate and its APR is wide, the difference is fees, and you should ask exactly which ones.
One more point: APR is a fair way to compare loans of similar length. For loans of very different lengths, still compare total dollars repaid, as in mistake #1.
3. Ignoring prepayment penalties
Say you get a bonus, a tax refund, or sell something big, and you want to clear the loan early. With some contracts you'll be charged for it. Lenders earn their profit from interest over time, so early payoff cuts into it. The penalty is usually a percentage of the remaining balance or a few months' worth of interest.
Are you about to make this expensive error? Watch out for this trap before you try to pay off your debt early.
Plenty of lenders don't charge it at all, so there's rarely a reason to accept one. Search the contract for "prepayment" and "early payoff." If it's there, ask for a version without it or take your business elsewhere.
4. Taking a variable rate without a plan
Variable-rate loans start cheap. After that, the rate follows a benchmark, and when the benchmark rises, your payment rises with it.
Reasons you might choose one:
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The starting rate is noticeably lower.
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You expect to repay the whole loan quickly, before rates have time to move.
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Rates fall, and your payment falls too.
Reasons to be careful:
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You can't predict your payment, which makes budgeting harder.
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You carry the risk, not the lender.
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The rate cap may be high enough to hurt anyway. Ask what it is.
For a long loan on a tight budget, fixed is the safer default. If you do go variable, find out the cap and work out what your payment would be at that cap. If you couldn't pay it, you shouldn't take the loan.