Add yourself (or be added) to a seasoned card to inherit 15+ years of on-time history.
Adding an authorized user to an aged, high-limit, low-utilization credit card causes that account's full history to report on the AU's credit file within 30–60 days — often boosting FICO 40–120 points. Common family use: parents add adult children pre-mortgage. Commercial 'tradeline rental' services exist ($100–$500/mo per line) but carry regulatory and ethical risk. IMPORTANT: legally only usable by actual authorized users; do NOT use for loan fraud.
Click Generate advisory deep dive for mechanics, IRC citations, a step-by-step execution plan, a worked numeric example on your profile, costs, risks, and this-week actions.
Build $100K–$500K of 0% intro-APR unsecured credit.
Stack personal 0% purchase/BT cards; deploy the float into cash-flowing assets.
3% BT fee for 18mo = ~2% APR — arbitrage vs 5% T-bill / private lending yield.
Route all business AP through 2%+ cashback cards — permanent margin lift.
Amex MR / Chase UR / Cap One transfers = 4–8¢/pt on business travel.
Sequenced personal + EIN-only biz apps for $20–50K/yr in tax-free SUBs.
Multiply SUBs and 3–5x category earnings without new hard pulls.
Pay earnest money, closing costs, or seller with a card at 2.9% fee.