Which card earns more on utility bills?

It depends on your monthly bill and whether utilities are your top spending category. U.S. Bank Cash+ lets you pick utilities as a 5% category with a generous quarterly cap, so it usually wins for steady payers. Citi Custom Cash only pays 5% if utilities is your single highest category that cycle, and the cap is much smaller. Always confirm both cards still list utilities as eligible against the issuer's current terms.

Do utility companies let you avoid the credit card fee?

Sometimes. Many billers waive fees for bank-account (ACH) payments but charge a convenience or service fee for card payments. Some accept cards with no fee, especially municipal or co-op utilities. Check your biller's payment page before assuming the rewards are free money.

Does the processing fee really cancel out the cash back?

It often does. If your card earns 5% but the biller charges a flat convenience fee or a percentage service fee close to or above your reward rate, your net gain shrinks or disappears. Run the math on your specific bill size and fee before paying by card.

Can I use both cards for utilities?

Yes, if you carry both. A common setup is to route utilities to whichever card and cycle gives the better net return, but managing two cards and two caps adds complexity. Most households are better served by picking one primary utility card.

Are the 5% categories and caps fixed forever?

No. Issuers change eligible categories, caps, and which merchants code as utilities. Re-verify the terms before you apply and again when you set your quarterly selections.

Citi Custom Cash vs U.S. Bank Cash+ for Utility Bills

Utility bills are predictable, recurring, and often large enough to matter. That makes them a tempting target for a 5% cash-back card. Two of the most-discussed options are the Citi Custom Cash and the U.S. Bank Cash+ Visa Signature. They both advertise 5% rewards, but they reach that number in completely different ways, and one structural detail can decide which one actually pays you more.

This guide walks through how each card treats utilities, gives you a decision tree keyed to your monthly bill, a break-even table, and the single gotcha that quietly erases the bonus for many households.

How each card pays 5% on utilities

The mechanics matter more than the headline rate.

U.S. Bank Cash+: utilities as a selectable category

The Cash+ card lets you pick your own 5% categories each quarter from a published list, and home utilities is one of the choices (verify it is still on the current list, since issuers rotate categories). You earn 5% up to a combined quarterly cap on your chosen 5% categories, after which the rate drops to the base 1%. The cap is measured per quarter, not per month, which gives utility payers meaningful headroom across three billing cycles.

The trade-off: you have to remember to log in and select utilities each quarter. Forget, and you may earn only the base rate.

Citi Custom Cash: 5% only if utilities is your top category

Citi Custom Cash takes a different approach. It automatically pays 5% on your single highest eligible spending category each billing cycle, up to a per-cycle cap, then drops to the base rate. You never pick a category. The card picks it for you based on where you spent the most.

There are two catches. First, utilities must actually be on Citi’s list of eligible categories (confirm against the issuer’s current terms, as this can change). Second, and more important, utilities only earns 5% if it is your top category that cycle. Spend more at restaurants or grocery stores and those win instead, dropping your utility spend to the base rate.

The structural difference in one line

U.S. Bank Cash+ rewards utilities on purpose, with a large quarterly cap. Citi Custom Cash rewards utilities by accident, only when they happen to be your biggest category, with a smaller monthly cap.

A decision tree by monthly utility spend

Use your typical combined monthly utility bill (electric, gas, water, and similar charges that code as utilities) to find your path.

Is paying by card fee-free or close to it? If your biller charges a large flat or percentage fee, stop here and read the gotcha section first. Rewards may not survive the fee.
Are utilities reliably your single largest spending category each month? If yes, Citi Custom Cash can work hands-off. If no (you also spend heavily on dining, groceries, or gas), Citi will likely reward those instead, not your utilities.
Do you want to set and forget, or are you willing to select a category quarterly? If you will reliably select utilities each quarter, U.S. Bank Cash+ gives the bigger cap. If you want zero maintenance and utilities is your top spend, Citi Custom Cash fits.
Is your monthly utility bill large? The bigger your bill, the more the cap difference matters. A generous quarterly cap protects more of your spend at 5% than a tighter monthly cap.

For most households with steady, sizable utility payments who do not mind a quarterly click, U.S. Bank Cash+ is the more reliable utility earner. Citi Custom Cash shines for people whose top category genuinely is utilities and who value automation.

Break-even table by bill size

This table assumes a 5% earn rate and shows roughly how large a processing fee can be before your reward is wiped out. The break-even fee equals your reward, so any fee at or above it means you net zero or lose money. Exact card caps and fees change, so treat these as illustrative and verify your own numbers.

Monthly utility bill	5% reward on that bill	Break-even fee (reward = fee)	Net if biller charges ~2.5% service fee
$100	$5.00	$5.00 (5%)	+$2.50
$200	$10.00	$10.00 (5%)	+$5.00
$300	$15.00	$15.00 (5%)	+$7.50
$400	$20.00	$20.00 (5%)	+$10.00
$500	$25.00	$25.00 (5%)	+$12.50

The pattern: a percentage service fee below your reward rate still leaves you ahead, but a flat convenience fee hurts small bills the most. A $3 flat fee on a $100 bill eats most of a $5 reward. The same $3 fee on a $500 bill barely dents a $25 reward.

The gotcha: processing fees can erase the bonus

Here is the detail that catches people. Many utility companies do not absorb card-processing costs. They pass them on as a convenience fee or service fee when you pay by credit or debit card, while keeping bank-account (ACH) payments free. The Consumer Financial Protection Bureau describes these as pay-to-pay fees, charged when you pay through a particular channel, and notes they often run from a few dollars to fifteen dollars or more.

Two fee shapes are common:

Flat convenience fee: a fixed dollar amount per payment. This punishes small bills, because the fee is a larger share of the charge.
Percentage service fee: a percent of the payment amount. If this percentage is at or above your reward rate, the card stops being worth it for that biller.

Before you route a utility to either card, open the biller’s payment page and find the exact fee for credit cards. Then compare it to the reward on your typical bill using the table above. If the fee meets or beats your reward, pay by free ACH instead and skip the card entirely. If the fee is comfortably below your reward, the card wins.

A few utilities, often municipal systems and co-ops, accept cards with no fee. Those are the cleanest wins for a 5% card.

How to decide in practice

Start with the fee, not the card. The richest rewards rate loses to a single line item on the biller’s checkout page. Once you confirm a card payment is fee-free or cheaper than your reward, choose based on structure: U.S. Bank Cash+ for the larger quarterly cap and deliberate category control, Citi Custom Cash for automation when utilities is your top monthly category.

Finally, re-check the terms periodically. Eligible categories, caps, and merchant coding all shift over time, and a category that qualified last year may not this year. Both issuers publish current details on their official card pages, which should be your source of truth before you apply or set your selections.

This article is general information, not personalized financial advice. Confirm all rates, fees, and category terms with the issuers before acting.