Authorized user effects

TL;DR

• Being added as an authorized user on a spouse or parent's long-history, low-utilization, on-time card boosts your score. It can hurt if the primary account is new, maxed, or late.
• AU accounts show up on your credit report and count toward utilization and payment history, but not toward inquiries (no hard pull is run on AUs).
• Chase largely excludes AU accounts from their 5/24 count. Amex and most other issuers don't care about AU for their velocity rules.

What an authorized user actually is

The primary cardholder adds you to their account as an authorized user. You get a card with your name on it, can make charges, but you're not legally liable for the balance — the primary is. Some issuers report the tradeline to the bureaus under your name; some don't.

Issuers that typically report AU tradelines to bureaus:

• Chase (all personal cards)
• American Express (all personal cards)
• Bank of America
• Citi
• Discover
• US Bank

Issuers that don't report AU tradelines (or report them as "participant only"):

• Capital One (started reporting more fully in 2022, still inconsistent)
• Barclays (varies by card)

If the issuer reports, the account shows on your file with the primary's full history — opening date, payment history, balance, limit.

When AU helps

Old card + low utilization + perfect payment history → max benefit.

Example: your spouse has a Chase Sapphire Preferred they opened 12 years ago, always pays in full, carries $500 balance on a $20,000 limit. Adding you as AU:

• Adds a 12-year-old tradeline to your file (boosts length of credit history)
• Adds a near-zero utilization account (lowers your overall utilization)
• Adds 12 years of on-time payment history (payment history bump)

For a thin file, this can add 30-60 points to FICO on the first reporting cycle.

When AU hurts

New card (under 2 years old) → drags your average age of accounts down.

High utilization on the primary's account → inflates your utilization.

Any late payment on the primary's account → immediately hits your score. Even if you had nothing to do with the payment, the AU tradeline reports the same late to your file.

Collections or charge-off on the primary's account → major damage. Never be an AU on an account in trouble.

Removing yourself from a bad AU account

Call the issuer and ask to be removed. They can usually do it in one call, though some require the primary cardholder to make the request.

Once removed, the account typically drops off your credit file within 30-60 days. A few bureaus leave historical AU entries visible but marked as removed — the account's payment history still contributes until it fully ages off.

Chase 5/24 and authorized user accounts

Chase's 5/24 rule counts personal credit card accounts opened in the last 24 months. Chase's internal underwriting rules (confirmed by thousands of Doctor of Credit reports) usually exclude AU accounts from the count.

In practice: if you have 4 primary personal cards opened in the last 24 months, plus 3 AU tradelines on your spouse's cards, Chase treats you as 4/24, not 7/24. You're still eligible for Chase cards.

But the AU tradelines do show on your file and do affect FICO score, utilization, and other factors. They just don't count against Chase's internal "too much new credit" rule.

See Chase 5/24 — the deep dive for how to call in and ask Chase to remove AU entries from your application if they're being counted.

Other issuers

• Amex velocity rules (2/90, 1/5, 1/8) — AU accounts don't count. Only cards you've opened as primary.
• Capital One — doesn't have a public velocity rule, but internal guidance treats AU similarly.
• Citi 1/8 rule — AU accounts don't count.
• Barclays 6/24 (informal) — AU generally doesn't count.

Piggybacking — legal but controversial

"Piggybacking" refers to being added as an AU on someone else's account purely for the score boost. Services exist that will rent you AU spots on strangers' long-history, low-utilization cards. Illegal? No. But:

• FICO 8 and later models weight AU tradelines more conservatively specifically to reduce piggybacking benefit.
• Lenders who do manual review can see AU tradelines marked as such on the file and may discount them.
• Some services charge $500-$2,000 per AU spot, which is a poor return vs just paying down your own balances.

For real couples or parent-child relationships, AU tradelines are legitimate score-building tools. Paid piggybacking is risky and increasingly ineffective.

Best practices

For couples: put each spouse as AU on the other's oldest card. Each partner's credit file gets both histories, both utilizations, both payment records. Compounds over time.

For young adults (18-23): being added as AU on a parent's long-history card is the fastest way to build a usable credit file. FICO can score a file with an AU tradeline from day one.

Before applying for Chase cards: if your AU tradelines are pushing you over 5/24 on the raw count, call Chase before applying. Ask the underwriter to exclude AU tradelines from the 5/24 count. Often succeeds.

Before applying for Amex cards: doesn't matter — Amex won't count AU against velocity rules.

Sara-and-Blake style strategy

For couples playing the points game:

• Each spouse opens their own cards as primary (each gets their own sign-up bonus).
• Add each spouse as AU on the other's cards that earn transferable points (Chase UR, Amex MR, Capital One Venture).
• All points pool into shared loyalty programs.
• Both spouses see both tradelines on their reports — utilization on both, payment history on both.

This is the fastest way to double your household's bonus earning AND build both spouses' credit files simultaneously.

Bottom line

• AU on a good primary account (old, low-util, on-time) is a free score boost.
• AU on a bad account is dangerous — their missed payment is now your missed payment.
• Chase excludes AU from 5/24. Amex doesn't count AU for 2/90, 1/5, 1/8.
• Couples should AU each other on their oldest cards to share full history.