A credit score is supposed to measure how reliably you pay what you owe. For decades it measured something narrower: how reliably you paid loans and credit cards. Rent, utilities, the phone bill and the cash in your checking account were invisible unless something went wrong and a collection showed up. The result is a familiar trap. People who never borrow, or who are new to the country or to adulthood, get treated by lenders and landlords as if they had bad credit rather than no credit. Alternative credit scoring is the effort to widen what the score can see. In 2013 that meant a handful of fringe services. In 2026 it has moved into the mainstream models, including the ones that decide mortgages.

Why a thin file hurts as much as a bad one

Traditional scoring models need history to work with. With no accounts, or only one or two young ones, the model either cannot produce a score at all or produces a cautious one, and that shows up everywhere a report gets pulled: mortgage applications, car loans, apartment screening, utility deposits. The old advice was to borrow purely to build a file: open a card, use it lightly, wait. That still works, and a secured card or a credit-builder loan remains the standard starting point. But it means taking on a credit product to prove something your bank statement already shows.

What alternative data means today

The 2013 version of alternative scoring was a set of independent companies that would verify your rent and utility payments, usually for a fee, and produce a report that only their partner lenders accepted. Those pay-to-verify services, and the “expansion” scores built on that kind of data, are history. What replaced them is data flowing into the files and models lenders already use.

  • Experian Boost (since 2019). Free, and it adds on-time utility, phone, streaming and rent payments to your Experian file. Two limits: it touches only Experian, so a lender pulling Equifax or TransUnion sees nothing, and the effect is a modest lift for some thin files rather than a transformation.
  • Rent reporting. Landlords and third-party rent-reporting services can send your payment history to the bureaus, where the newer models read it. Fannie Mae also counts positive rent-payment history in its own underwriting, drawing it from bank-statement data through its Desktop Underwriter system, and runs a multifamily reporting program that gets rent payments from participating landlords onto tenants’ credit reports.
  • New mortgage scores. Since April 22, 2026, Fannie Mae and Freddie Mac accept VantageScore 4.0 and FICO Score 10T from all lenders, and HUD is adopting both for FHA loans. Both models can use rent, utility and telecom data when it has been reported. The change is lender-optional and the three-bureau report is still required, so ask a lender which models it uses before assuming your rent history will count. It is a major shift; a brief history of FICO puts it in context.
  • UltraFICO (generally available May 20, 2026). Built by FICO with Plaid, it lets you permission access to your bank accounts so the score can weigh cash-flow evidence — inflows, balances, spending — on top of the standard FICO scale. Nothing is shared unless you choose to share it.

What alternative data cannot do

  • It only helps if the history is good. Boost adds only on-time payments, but landlords and rent-reporting services can report late ones too, and a reported late payment is a negative mark like any other. Do not opt in to reporting until you have a clean streak to show.
  • It has to be reported to count. A perfect rent record that never reaches a bureau or a lender is worth nothing to a model. Someone — you, your landlord, a service — has to move the data.
  • It is lender-optional. The models exist; adoption is uneven. A bank that pulls an older FICO version from a bureau where none of your bills are reported is scoring the same thin file it always did.
  • It does not replace the basics. Payment history (35%) and amounts owed (30%) are still the two heaviest factors in a FICO score. Alternative data adds evidence; it does not change what the evidence has to show.

A practical path for a thin file

Start by pulling your reports, free every week from all three bureaus at AnnualCreditReport.com, to see what the bureaus already have on you. If the answer is almost nothing, opt in to Experian Boost, ask your landlord about rent reporting or sign up for a reporting service, and open a secured card or credit-builder loan that you pay in full every month. When you get to a mortgage, ask whether the lender uses VantageScore 4.0 or FICO 10T and whether it looks at rent history in underwriting; if your borrowing history is thin but your checking account is orderly, ask whether UltraFICO is an option. The factors every model weighs are explained in how credit scores work.

Alternative scoring is no longer a nice idea that does not matter much. In 2026 it is part of the plumbing, and the borrowers who benefit are the ones who route their data through it.