What Is a Do-Not-Reduce (DNR) Order Instruction?
An open order sitting in the market doesn’t exist in isolation — corporate actions like dividend payments can reach in and shift its terms automatically, without anyone touching the order itself. A do-not-reduce instruction is the way to opt out of that automatic adjustment.
The short answer
A do-not-reduce (DNR) instruction tells a brokerage not to lower the price on an open good-til-canceled limit or stop order when the security pays a regular cash dividend and its price is adjusted down on the ex-dividend date. Without this instruction, many brokers automatically reduce the order’s price to account for the drop, keeping the order’s relative distance from the market price roughly the same. Adding a DNR instruction overrides that default and locks the order’s price in place regardless of the dividend adjustment.
Why prices get adjusted in the first place
When a company distributes a cash dividend, the ex-dividend date marks the point where new buyers are no longer entitled to that upcoming payment. Because the payout represents cash leaving the company, exchanges typically adjust the reference price downward by roughly the dividend amount at the open of that session. A standing limit order to buy at a certain price, or a stop order to sell if the price falls to a certain level, was set relative to a pre-adjustment price — so many brokers automatically shift the order down by the same amount to preserve its original intent.
What the default adjustment actually does
Picture a hypothetical limit order to buy at $48 when a stock is trading near $50. If that stock pays a $1 dividend and the price is adjusted down accordingly, a broker following the standard practice would lower the order to $47, keeping the same $2 gap from the new reference price. That adjustment happens quietly in the background — the person who placed the order may not notice unless they check the order details afterward.
What a DNR instruction changes
Attaching a do-not-reduce instruction tells the broker to skip that automatic adjustment and leave the order’s price exactly where it was set. Using the same example, the order would stay at $48 even after the dividend-related price drop, meaning it sits closer to the new market price than it would have otherwise — and could fill sooner, or fill under conditions the order-placer didn’t fully anticipate. It’s a way of insisting that the original number, not a recalculated one, is what matters.
When someone might reach for this instruction
The instruction tends to come up with orders tied to a specific, deliberately chosen price rather than a relative distance from the market. Someone using a stop-loss order to protect a position at an exact dollar level, for reasons unrelated to the dividend math, might not want that level nudged just because a payout occurred. On the flip side, someone who’s comfortable with the standard adjustment — because their order was always meant to track a certain distance from price — generally leaves the default behavior in place and skips the DNR instruction entirely.
Practical considerations
Not every brokerage offers a DNR instruction, and the mechanics of how and when adjustments happen can vary by platform, so checking the specific broker’s order-entry policies is worthwhile before assuming a particular behavior. It’s also worth remembering that a DNR instruction only affects the dividend-related adjustment — it doesn’t change anything else about how the order behaves, and it doesn’t extend or shorten how long the order stays open.
The takeaway
A do-not-reduce instruction is a narrow but useful override: it decides whether an open order’s price should move automatically when a dividend nudges the security’s reference price, or whether it should stay fixed at the number originally chosen. Understanding which behavior applies by default helps explain why a standing order might look slightly different after a dividend than expected.