Google Ads Promotion Mode: The Festive-Sale Bidding Guide for Indian D2C

Your festive discount just confused the bidding algorithm

You've seen this movie before. It's the first morning of your Diwali sale, you've slashed prices 30%, your creative is live, and Google Ads decides this is the perfect moment to throttle delivery. Impressions flatline. The dashboard shows "limited by Target ROAS." Your best sale of the year, and the auction is sitting on its hands.

That's not a bug. When you drop prices, your average order value falls, which drags down the revenue-per-click the algorithm has been trained on. If your Target ROAS is still set to 4, the system suddenly can't find enough clicks that clear that bar, so it stops bidding aggressively right when you want it to lean in. For years the only fix was to manually lower your Target ROAS before a sale and set a reminder to put it back after, which half the time you forgot.

Google's answer is Promotion Mode. It was announced in June 2026 by Ginny Marvin, Google's Ads Product Liaison, and it's built for exactly this problem. Here's what it actually changes, what it deliberately leaves alone, and how to run it for a festive push without gambling your whole month's budget.

What Promotion Mode actually is

Promotion Mode is a scheduled setting you switch on inside a campaign for a defined sale window. You tell it when your offer starts and ends, and during that window it relaxes the campaign's performance guardrails so the algorithm can spend into the demand spike instead of pulling back from it.

The key word is scheduled. This isn't a toggle you flip and babysit. Marvin addressed the most common worry directly: "With Promotion mode, there's no need to remember to come back to turn it off. The very first prompt is to set the start and end dates of the promotion." The promotion window runs 3-14 days and then the campaign goes back to normal on its own.

The two dials it moves

During the active window, Promotion Mode adjusts two things:

• ROAS tolerance. It widens the range the algorithm is allowed to operate within, so it'll keep bidding on clicks that look a little less proven than usual. In a sale, those "less proven" clicks are often just shoppers whose basket value shifted because everything's discounted.
• Daily budget. It adds supplementary budget for the window, so a genuinely good sale day isn't capped by a budget you set for an ordinary Tuesday.

What it does not touch

This is the part most people get wrong. Promotion Mode does not replace your bid strategy. If you're running Target ROAS or Target CPA, that strategy stays in place. Promotion Mode just loosens the guardrails around your target for the sale, then tightens them again. You're not throwing away months of conversion data; you're temporarily telling the system "read the room, it's a sale."

Why manual Target ROAS drops were always risky

Before Promotion Mode, the standard festive move was to cut your Target ROAS by, say, 25% a couple of days before the offer. It worked, but it had three failure points that every D2C team knows.

First, timing. Change it too early and you waste budget at full price; too late and you miss the first-day rush. Second, the reset. If you forgot to restore the target after the sale, the campaign kept spending loose for days, quietly burning margin. Third, the swing. A big manual change is a blunt instrument, and the algorithm can over-correct, so you'd see wild ROAS both during and after the sale.

Promotion Mode is meant to be the surgical version: a bounded window, an automatic reset, and a tolerance adjustment rather than a target rewrite. For an Indian D2C brand running four or five sale events a year (Diwali, end-of-season, Republic Day, a birthday sale, a Black-Friday-style push), that's the difference between a repeatable process and a scramble.

Setting it up for a Diwali or festive push

The mechanics are simple; the discipline around them is what matters.

The setup steps

The setup flow, in plain terms:

1. Open the campaign you're running the offer on (Search or Performance Max, in the current beta).
2. Turn on Promotion Mode and set your start and end dates first. Keep it inside the 3-14 day window.
3. Set your ROAS tolerance for the window rather than editing the underlying Target ROAS.
4. Confirm your budget. Promotion Mode adds budget, so make sure the topped-up daily spend is one you can actually stomach if the sale runs hot.

Give it learning time

Don't switch this on the morning your offer goes live. The algorithm needs a runway to read the new signals. Turning Promotion Mode on 24-48 hours before the public offer starts, with the window dated to match the sale, gives the system time to adjust delivery so day one isn't wasted on a cold start. If your festive sale opens Friday, set it up Wednesday.

And feed it the right conversion signal. If you're a COD-heavy brand, your "purchase" event in Google Ads should reflect confirmed or delivered orders, not just placed ones, or the loosened tolerance will happily chase orders that get returned to origin. That's a conversion-tracking hygiene point that matters ten times more during a discounted sale than on a normal day.

Promotion Mode vs the alternatives

You've got three ways to prepare a campaign for a sale. They're not mutually exclusive, but they behave differently.

A quick read: seasonality adjustments are about telling the system what to expect; Promotion Mode is about changing what it's allowed to do. For a multi-day festive sale with real discounting, Promotion Mode is the closer fit. For a 24-hour flash drop, a seasonality adjustment is often enough. And if your entire pricing strategy is changing for a season, a considered manual target change still has its place.

If mapping the right lever to each sale event, wiring COD-accurate conversion values, and watching post-sale ROAS sounds like more than your team can run mid-festive-season, that's the kind of thing our performance marketing work is built to handle end to end.

What we're still watching

Two things about Promotion Mode aren't fully nailed down yet, and it's worth being honest about them rather than pretending the feature is finished.

The Target ROAS edit lock

In late September 2026, advertisers reported that while a promotion is active, Google Ads won't let you edit the underlying Target ROAS at all. The interface reportedly shows a message along the lines of "You can't edit your Target ROAS while promotion mode is active" and points you to edit ROAS tolerance instead. This was surfaced by practitioners on LinkedIn rather than through an official Google announcement, so treat it as observed behaviour, not documented policy. Practically, it means you should get your base Target ROAS right before you start the promotion window, because you may be locked out of changing it until the sale ends.

The seasonality overlap

Because it's still in beta, Google's current documentation reportedly doesn't spell out how Promotion Mode and a seasonality adjustment interact if you set both on the same campaign at the same time. Until that's clarified, the safe move is to pick one lever per campaign per event rather than stacking them and hoping they cooperate.

A festive playbook you can actually repeat

Pulling it together for the season ahead:

• Pick your sale events for the year now, and decide which lever each one gets. Multi-day discount sales lean Promotion Mode; single-day flash drops lean seasonality.
• Lock your base Target ROAS and your conversion values before switching on a promotion, given the reported edit lock.
• Schedule the window 24-48 hours ahead of the public offer so the algorithm learns before the rush.
• Size the topped-up budget to a number you'd be genuinely happy to spend on a great day, not a panic number.
• Log what happened after each event, because Promotion Mode's whole value is that it's repeatable, and a short note on what tolerance worked for a 30%-off sale is gold next Diwali.

Promotion Mode won't invent demand you don't have, and it's still a beta feature, so it's one tool in the festive kit rather than the plan itself. But for the specific, maddening problem of a sale that chokes your own bidding, it's the cleanest fix Google has shipped in a while. Set it up with a little care, and your best sale days stop fighting your ad account.