Amazon PPC portfolios cap spend without pacing it, so a November cap can switch your ads off before Cyber Monday.

Amazon PPC portfolios put a hard ceiling over a group of campaigns, but the ceiling does not pace, so a monthly cap you set in October can switch your ads off on Cyber Monday. A portfolio is a group of campaigns with one optional budget cap on top. When the campaigns in it have spent the cap, Amazon stops all of them, including the ones with budget left. Most guides to Amazon PPC portfolios stop at "group by brand". This post covers the three cap types, how they stack with campaign budgets, and works one example through November, a 30-day month that ends on Cyber Monday.

Amazon PPC portfolios: what they do and what they don't

Amazon's help page on portfolios lists what they are for: grouping campaigns by brand, business line or season, a date-range or monthly budget cap, sharing unspent campaign budget between campaigns, reporting by portfolio, and billing broken down by portfolio. That is the whole list. A portfolio does not set bids, does not choose keywords and does not move money towards the campaigns that earn it.

It also does not spread spend over the month. Amazon's page on sponsored ads budgets says budgets are spent as quickly as possible and not paced. Tinuiti made the same point about portfolio caps when portfolios launched in 2018: the cap does not pace spend, and a single campaign can use up the whole portfolio budget. A cap is a wall, not a schedule.

The three budget caps, and which one to use

Amazon's portfolio budgets page gives three options:

• No budget cap. The default. Campaigns spend until their own budgets run out, as if the portfolio were only a folder.
• Recurring monthly cap. Resets on the first day of each month. If you switch it on mid-month, Amazon counts the full amount for that month and deducts what the portfolio has already spent.
• Date range cap. One amount for the dates you pick. If the date range ends before the campaigns do, the campaigns in the portfolio pause on the end date.

Use the monthly cap for always-on spend you want to keep inside a monthly number, such as one brand or one product family. Use a date range cap for an event: a separate portfolio for the Black Friday to Cyber Monday campaigns, so the event budget cannot eat the month's budget and the month's cap cannot starve the event.

Two billing details matter. Over a full period you are never charged more than the cap; Amazon credits back any over-delivery. But if you lower a cap below what the portfolio has already spent, the campaigns stop and there is no credit. In Amazon's example, a cap cut from $1,000 to $500 after $800 of spend is charged $800.

The November trap: a monthly cap that runs out before Cyber Monday

Take an example brand portfolio with three campaigns on daily budgets of $50, $30 and $20, so $100 a day. The seller set a recurring monthly cap of $3,000: $12,000 of expected monthly ad sales at a 25% target ACoS, which also equals $100 × 30 days. It looks safe. In a normal month it is.

November is not normal. Black Friday is Friday 27 November 2026 and Cyber Monday is Monday 30 November, the last day of the month. From 1 to 22 November the campaigns spend $90 a day, or $1,980. On 23 November a budget rule raises every daily budget by 50% for the event week, to $150 a day. The rule changes the campaign budgets. It does not touch the portfolio cap.

Four days at $150 bring spend to $2,580 by the evening of 26 November. Black Friday takes it to $2,730, Saturday to $2,880. On Sunday 29 November the portfolio reaches $3,000 after $120 of spend, and every campaign in it stops. On Cyber Monday it spends nothing. That is $180 of planned spend that never ran: $30 on Sunday and $150 on Monday. At the 25% target ACoS, it would have bought $720 of ad sales on two of the busiest days of the year.

And this example is the mild version. It assumes each event day spends only its new daily budget. In practice campaigns can spend more on a busy day, which reaches the cap sooner. More on that in the next section.

The rule: every time you raise a campaign budget, by hand or with a budget rule, raise the portfolio cap above it by the same amount for the same days. The cap always wins, and it does not pace.

The fix in this example is $400: eight event days from 23 to 30 November at $50 extra a day. A $3,400 cap covers the planned $3,180 with room to spare. If you notice too late, Amazon says raising the cap or removing it starts the campaigns delivering again. Noticing is the hard part on a Sunday of a deal weekend.

How campaign budgets, shared budget and the cap stack

Three limits decide whether a campaign in a portfolio can spend, and they apply in order.

The campaign's daily budget is an average, not a daily wall. Amazon's budgets page describes it as the most you spend on average each day over a calendar month. Leftover funds from slow days can raise a busy day's budget by up to 100%, which the page gives as the default, with a 25% option in campaign settings. Over the month, spend stays at or under the daily budget times the days in the month.

Unspent campaign budget can move between campaigns. With this setting on, Amazon's page on unspent campaign budget, updated in October 2026, says Sponsored Products, Sponsored Brands and Display campaigns that have spent their full daily budget can use what other campaigns in the portfolio left over, spending up to 100% more than their average daily budget on a given day. In Amazon's example, three campaigns each have $100 a day. On day one two of them leave $30 and $50 unspent, so the third can spend up to $180 the next day. The pool resets at the start of each month.

The portfolio cap sits over both. Amazon is explicit that the portfolio cap overrides campaign budgets and takes precedence over shared unspent budget. Its own example: two campaigns with $500 lifetime budgets in a portfolio capped at $750. Once campaign A has spent its $500, campaign B can spend only $250 before the portfolio stops.

The practical reading: shared budget and the 100% daily overspend both let money move to the busy days, which is what you want on Black Friday. They also bring the cap closer, faster. Amazon recommends giving your best campaigns a higher budget than the portfolio's cap, so the cap is the only real limit. That works only if the cap itself is sized for the month you are in.

Build portfolios around profit, not just around brands

A cap is only as good as the number behind it. "$3,000 because it felt right" protects nothing. Size it the way the example did: expected ad sales times the ACoS that product can afford. That ACoS comes from the margin, and it differs by product. If you have not worked it out, our break-even ACoS guide does it step by step.

• Group products that share a break-even. A portfolio that mixes a 40% margin hero product with a 15% margin add-on gives both one ceiling. The thin one, as our post on low margin products shows, needs a much smaller one.
• Keep tests apart from proven campaigns. A launch or discovery campaign in the same portfolio as your best exact-match campaign can spend the shared cap first. Give it its own portfolio and its own small cap.
• One portfolio per marketplace and brand. If you sell in several marketplaces, each has its own currency, prices and demand. Size a German cap in euros from German sales, not from a US plan in dollars.
• Use the cap as the brake, not the bid. If a portfolio keeps hitting its cap, the question is whether its ACoS is under break-even. If it is, raise the cap. If not, lower the bids, the same test as in our guide to an Amazon campaign out of budget.

What to do before Black Friday

1. List every portfolio with a cap and note its type: monthly or date range, and the end date.
2. Add up the planned November spend in each one: spend so far, plus the remaining days at the daily budgets your budget rules will set.
3. Raise any cap that sits below that total, with a buffer for the busy days that can spend up to 100% over their daily budget.
4. Give the event its own portfolio with a date range cap from the start of your budget rules to Cyber Monday, sized at the deal price's break-even. Our Q4 2026 Black Friday and Cyber Monday plan has the full calendar.
5. Check spend against each cap every morning from Black Friday to Cyber Monday, and set December's caps before 1 December, when the monthly caps reset.

Mirox handles the bid side: it sets each bid against the product's margin and writes down the reason and the numbers, inside a daily budget you set and Amazon enforces. The 30-day free trial runs live on up to 50 of your parent ASINs in 1 marketplace, on campaigns Mirox builds for them, so your existing campaigns stay untouched.

Common questions

What is a portfolio in Amazon Ads?

A group of campaigns you manage together. Amazon lets you organise portfolios by brand, product category or season, put one budget cap over all the campaigns in it, and report on them as one unit. Portfolios do not change bids or targeting.

Does a portfolio budget override campaign budgets?

Yes. When the portfolio cap is reached, every campaign in it stops delivering, even campaigns with budget left. Each campaign’s own daily budget still applies underneath, so a campaign stops at whichever limit it hits first.

What happens when a portfolio reaches its budget cap?

All its campaigns stop until the cap resets on the first of the month or you raise or remove it. Once you raise the budget or extend the date range, Amazon says the campaigns start delivering again.

Do I need portfolios in Amazon PPC?

No. The default is no budget cap, and campaigns run fine outside portfolios. They earn their place when you need a hard monthly ceiling, a separate event budget or one report per brand or product family.

The one-line version

A portfolio cap stops every campaign under it and never paces, so whenever a campaign budget goes up, the cap above it goes up too.

Want to see the numbers behind every bid? Read how transparency works, then size the caps with how much to spend on Amazon Ads.