If you’re wondering why your TransUnion credit score dropped, the cause is almost always one of a short list: a higher balance reported on a credit card, a payment that slipped past 30 days late, a new hard inquiry, an account that closed, a reporting error, or a new collection or public record. Each one affects your score differently, and each has a different fix.
Your Credit Card Balance Went Up
Credit utilization—the share of your available revolving credit you’re currently using—makes up roughly 30 percent of a FICO score.1myFICO. How Are FICO Scores Calculated TransUnion tracks it both per card and across all your revolving accounts combined. A $2,500 balance on a card with a $5,000 limit is 50 percent utilization on that card, and that alone can pull your score down even if every other card sits at zero.
Scoring models penalize utilization more heavily once it crosses about 30 percent, and the highest scorers tend to keep it in single digits. The catch is timing. Creditors usually report the balance that’s on the card at the statement closing date, not what’s left after your due-date payment. You can pay in full every month and still look highly utilized if a big charge happened to be sitting there when the statement cut. Paying before the statement closes, not just before the due date, is the practical fix.
A less obvious trigger is a credit limit reduction. A card issuer can lower your limit without asking. If your combined limit drops from $10,000 to $7,000 while you still owe $3,000, utilization jumps from 30 percent to about 43 percent, which is enough to show up as a score drop even though your spending never changed.
A Payment Was Reported Late
Payment history is the single largest FICO factor at about 35 percent.1myFICO. How Are FICO Scores Calculated Creditors generally don’t report a missed payment until it’s at least 30 days past due.2TransUnion. How Long Do Late Payments Stay on Your Credit Report Before that, you may owe a late fee, but your score usually isn’t touched.
Once a 30-day delinquency lands on your report, the hit can be severe, and it’s larger for scores that started high. Someone above 780 generally loses more points than someone at 650, because the model treats a sudden break in a clean record as a sharper signal. Payments that reach 60, 90, or 120 days past due cause further drops at each stage, though the first 30-day report tends to be the hardest blow. A late payment stays on your TransUnion report for seven years from the date of the original delinquency, but its effect fades over time as newer on-time payments accumulate.2TransUnion. How Long Do Late Payments Stay on Your Credit Report
If the late payment was a one-time slip and your history is otherwise clean, you can ask the creditor for a goodwill adjustment: a request to remove the late mark as a courtesy. Creditors aren’t required to agree, and many large issuers decline, but it costs nothing to ask when the facts favor you.
A New Hard Inquiry Posted
Applying for a credit card, auto loan, mortgage, or other financing triggers a hard inquiry. A single hard inquiry usually costs fewer than five points.3Experian. How Many Points Does an Inquiry Drop Your Credit Score Several applications in a short span can add up and signal financial stress to the model.
Hard inquiries stay on your TransUnion report for two years, though FICO only counts those from the past 12 months.4Experian. How Long Do Hard Inquiries Stay on Your Credit Report Soft inquiries, including checking your own score or an employer background check, don’t affect it.
Rate shopping is treated differently. Newer FICO versions group multiple inquiries for the same loan type—mortgage, auto, or student—into one if they fall within a 45-day window; older versions use 14 days.5myFICO. Do Credit Inquiries Lower Your FICO Score VantageScore uses a 14-day window.6TransUnion. How Rate Shopping Can Impact Your Credit Score This protection does not extend to credit card applications; each one counts on its own.
You Closed an Account—Or Lost One
Closing a credit card removes that card’s limit from your available total, which can spike utilization overnight. Close a card with a $15,000 limit while carrying $3,000 elsewhere, and that $3,000 suddenly represents a much larger share of your remaining credit.
Closed accounts in good standing generally stay on your report for about 10 years before falling off.7Consumer Financial Protection Bureau. How Long Does Information Stay on My Credit Report Once an old account drops off, you lose that stretch of history. If the card was your oldest account, that eventual removal shortens your average account age, which scoring models penalize.
A few other moves can produce the same kind of surprise drop:
- Paying off an installment loan. Closing out a car loan, mortgage, or student loan removes an account type from your credit mix. Losing your only installment loan can nudge your score down even though being debt-free is a good outcome.
- Being removed as an authorized user. If you came off someone else’s card, you lose that card’s history and available credit on your report, which can shorten your average account age and raise your utilization.
- A lender cutting your credit limit, as covered above.
These drops are usually small and temporary. On-time payments and low utilization pull the score back up.
Something on the Report Isn’t Yours or Isn’t Right
Errors can cost you points you never earned. Common ones include mixed files, where someone with a similar name or Social Security number has data merged into yours, and inaccurate account statuses, like an account marked delinquent that you actually paid on time. Under the Fair Credit Reporting Act, TransUnion must investigate any item you dispute and correct or delete inaccurate information within 30 days of receiving your notice.8Office of the Law Revision Counsel. 15 USC 1681i – Procedure in Case of Disputed Accuracy
Identity theft is another common cause. An unexplained score drop paired with accounts you don’t recognize is a strong signal your information was used to open credit in your name. Two tools help if you suspect fraud. A credit freeze blocks anyone, including you, from opening new accounts using your TransUnion report until you lift it; it’s free, lasts until you remove it, doesn’t affect your score, and must be placed separately at each bureau.9TransUnion. Credit Freeze A fraud alert requires lenders to verify your identity before granting new credit but doesn’t block access to your report; an initial alert lasts a year and can be renewed, and an extended alert for identity theft victims lasts seven years. You only need to contact one bureau, and it must notify the other two.10Consumer Advice – FTC. Credit Freezes and Fraud Alerts
A Collection or Public Record Showed Up
An unpaid debt sold to a third-party collector creates a new negative mark on your report. The three major bureaus voluntarily stopped reporting medical debts under $500 in 2023, so a small medical bill below that threshold won’t appear, but non-medical debts of any amount can still be sent to collections and reported.11Consumer Financial Protection Bureau. Prohibition on Creditors and Consumer Reporting Agencies Concerning Medical Information (Regulation V)
Bankruptcy is the most severe derogatory mark. Federal law allows a bankruptcy to remain on your report for up to 10 years from the filing date.12Office of the Law Revision Counsel. 15 USC 1681c – Requirements Relating to Information Contained in Consumer Reports The point hit depends on your starting score; someone at 750 could lose 200 points or more, while a score already weighed down by missed payments may drop less.
How to Dispute an Error With TransUnion
If the drop traces to information you believe is wrong, you can dispute it directly with TransUnion. The three channels are online through the TransUnion Service Center, by phone at 800-916-8800, or by mail to TransUnion Consumer Solutions, P.O. Box 2000, Chester, PA 19016-2000.13TransUnion. Credit Disputes14TransUnion. Dispute Your Credit Report by Mail or Phone A mailed dispute should include your full name, date of birth, current address, Social Security number, the name and partial account number of the item, and the reason you believe it’s inaccurate.
TransUnion generally has 30 days to investigate once they receive your dispute.8Office of the Law Revision Counsel. 15 USC 1681i – Procedure in Case of Disputed Accuracy If you filed after pulling your free annual report, the window extends to 45 days. TransUnion then has five business days to send you the results.15Consumer Financial Protection Bureau. How Long Does It Take to Repair an Error on a Credit Report
If the investigation confirms the error, your report is corrected and your score should move once the updated data flows through. Lenders typically send updates to the bureaus once a month, so the change may not be immediate.16TransUnion. How Long Does It Take for a Credit Report to Update If you’re mid-mortgage or mid-loan and need faster results, ask your lender about rapid rescoring, a paid service that can push an update through in days. Only a lender can initiate it on your behalf.