Alliant Credit Union mortgage review: rates, costs & calculator

Alliant Credit Union at a glance

Alliant Credit Union traces its roots to 1935, when it was founded as the United Airlines Employees' Credit Union to serve a few dozen airline workers in Chicago.

It rebranded as Alliant in 2003 and steadily opened its field of membership, and today it is the largest credit union headquartered in Illinois, with well over 900,000 members and roughly $20 billion in assets.

Despite the Chicago base, Alliant lends across the country: in 2025 its single largest market by mortgage count was California, followed by Illinois, Florida, Washington and Arizona.

What sets Alliant apart is that it is genuinely branchless. It closed its last physical offices in 2020 and now runs entirely online, meaning the whole mortgage journey, from application to document upload to closing coordination, happens through its website, app and phone-based loan officers.

Where Alliant Credit Union's approval rate sits

Alliant Credit Union's 2025 approval rate of 65.3% sits against the 76.6% national average. Read it as a signal of channel, not strictness — wholesale, online and refinance-heavy lenders run lower because so many applications are rate shops that never close.

Membership is open to essentially anyone: if you don't qualify through an employer, family or geographic tie, you can join by becoming a member of the Alliant Credit Union Foundation, and the credit union covers the one-time $5 fee on your behalf.

Borrowers can even start a mortgage application before formally joining, only completing membership before closing.

In 2025 Alliant originated about 8,359 mortgages worth roughly $2.6 billion, for an average loan of around $311,600, a figure that reflects a mix of mainstream conventional lending alongside its higher-balance jumbo business.

Its reported approval rate was about 65 percent on 8,359 originations against 4,440 denials, in line with a national, direct-to-consumer lender that draws a wide and self-selected online applicant pool.

Who Alliant Credit Union is best for

Alliant suits self-directed borrowers who are comfortable handling a mortgage entirely online and want credit-union-style pricing and low fees without needing a local branch.

It is a particularly strong fit for first-time buyers drawn to its low- and no-down-payment conventional program and for physicians and other medical professionals who want a doctor loan with little money down and no PMI.

Loan programs at Alliant Credit Union

Its most notable programs and specialties:

• Conventional fixed- and adjustable-rate mortgages
• Alliant Advantage Mortgage (AAM): as little as 0% down with no PMI for first-time buyers on loans up to $650,000
• Medical professional (doctor) loans with up to 0% down and financing up to roughly $776,551 for qualifying physicians
• Jumbo loans (fixed and adjustable) for balances above conforming limits
• Home equity lines of credit with a 10-year interest-only draw and no application, appraisal or closing fees on lines up to $250,000
• Rate-and-term and cash-out refinancing

Typical industry minimum down payment by core loan type — Alliant Credit Union's own minimums or credit overlays may run higher:

Where Alliant Credit Union lends most

By federal HMDA records, Alliant Credit Union's largest 2025 markets were California, Illinois, Florida, Washington and Arizona. Explore local rates, home prices and down-payment assistance for each:

The verdict

Alliant is a solid, low-fee, digital-first choice for borrowers who value convenience and don't need a branch, and its no-PMI, low-down-payment conventional and doctor-loan programs stand out for first-time and medical-professional buyers.

Weigh those strengths against rates that reviewers say can run above average, a lighter government-loan menu, and an entirely online, self-service experience before deciding it fits your situation.

How to compare Alliant Credit Union

Shopping a few lenders is the single most reliable way to save. Before you commit to Alliant Credit Union:

1. Get three or more Loan Estimates in a two-week window — the bureaus treat it as one inquiry.
2. Compare the APR, not just the headline rate — it folds in the fees.
3. Weigh service and loan-type fit, not price alone.
4. Verify licensing: search Alliant Credit Union on NMLS Consumer Access and match the NMLS ID to the one on your Loan Estimate. (Its LEI in federal HMDA data, 549300T94GSH3C4U5M59, is not a license number.)

Benchmark whatever you're quoted against today's the national rate benchmark.