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Library · Federal employees and military · Published 9/29/2026

Deployment and the Savings Deposit Program

How the Savings Deposit Program lets deployed service members save pay at a fixed rate, and where to confirm the limits that apply to you.

In short

A friend of mine served on a ship that spent most of a year at sea, and he told me the paycheck was the one thing that felt steady out there. If you are a service member on a qualifying deployment, the Savings Deposit Program lets you put part of that pay into a special account. The account pays a fixed rate set by law, and the rate is the current figure, which the official source publishes each year percent a year. You can deposit up to the current figure, which the official source publishes each year dollars, and only while you serve in a qualifying area. Your finance office can tell you what the first step is, because the paperwork starts there. The official DFAS page explains how long interest keeps running after you leave the qualifying area. Small questions asked early save big headaches.

The whole of it

What it is

I once watched a young sergeant count his pay on a folding table and grin, because he knew there was nothing out there to spend it on. That is the spirit behind the Savings Deposit Program, often called the SDP. It is a program for members of the uniformed services who are deployed to a designated combat zone or a similar qualifying area. It lets you park your money in an account that pays a fixed rate set by law.

The program is set up under federal law, and the Department of Defense runs it through the military pay system. The Defense Finance and Accounting Service, known as DFAS, handles the pay side. The Department of Defense Financial Management Regulation explains the rules in detail. You do not need to be an expert to use it. You need to know who qualifies, how much you can save, and when the interest starts and stops.

How it works

If you are heading out on a deployment, you have probably wondered how to make the extra pay count. You start by asking your finance office how to sign up. You choose how much to deposit each month. You can also make a lump sum deposit, though the total cannot pass the limit set by law, which is the current figure, which the official source publishes each year dollars.

Your deposits come out of your pay, and the interest builds up on a schedule. The rate is the current figure, which the official source publishes each year percent a year, and it compounds every quarter. That means each quarter's interest is added to your balance, and then the next quarter's interest is figured on the larger amount. Small habit, steady growth.

Interest only counts while you serve in a qualifying area. When your service there ends, interest keeps running for a limited period afterward, which the regulation spells out. After that, the account stops earning. You can leave the money in the account until you are ready to take it out, but you will not earn more interest once that period closes. The balance is paid to you as a lump sum when you withdraw it.

Here is the part folks sometimes miss. You do not get to deposit whenever you please. You deposit while you serve in the qualifying area, and your unit finance office sets up the deductions. If the paperwork is not done, the deposits do not happen. That is why your first visit to the finance office matters.

The numbers, and where to find yours

You have probably noticed that a program like this lives or dies by its numbers, so let me tell you where the real ones sit. Each figure below is set by law or regulation, and I will not guess at any of them here. The interest rate is the current figure, which the official source publishes each year percent a year. The deposit limit is the current figure, which the official source publishes each year dollars. The grace period after you leave the qualifying area is the current figure, which the official source publishes each year.

To find your own numbers, start with your finance office. They can tell you which of your assignments count as qualifying and how much of your pay is eligible. You can also read the DFAS page on the Savings Deposit Program, which is the official source. The Department of Defense Financial Management Regulation lays out the full rules and is worth a look if you like to read the fine print.

Your own pay records matter too. Your Leave and Earnings Statement, or LES, shows your monthly pay and any deductions. Look there to confirm that your SDP deposits are coming out and landing where they should. Check it every month. It takes five minutes.

One more thing to know. The program is for the person who serves, not for a spouse or a family member. Your eligibility depends on your own orders and your own assignment. If you are unsure, ask before you deploy, not after.

A worked example

A friend of mine named Marcus was a staff sergeant who headed out on a nine month deployment. He is a made up figure for this page, but his numbers are plain and easy to check. Suppose Marcus deposits 1,000 dollars a month for nine months. Suppose, for the sake of the math, that the rate is 10 percent a year, so 2.5 percent each quarter. I use 10 percent here only to keep the arithmetic clean. Your real rate is the one set by law, which is the current figure, which the official source publishes each year percent.

Marcus deposits 1,000 dollars each month for nine months. His total put in is 9 times 1,000, which is 9,000 dollars. That total sits under the limit, so he stays within the rules.

Now for the interest, in rough terms. His first deposit sits the longest, so it earns the most. Say it earns interest for three full quarters. On 1,000 dollars at 2.5 percent, one quarter earns 25 dollars. Over three quarters with compounding, that grows to 1,000 times 1.025 times 1.025 times 1.025, which is about 1,076.89 dollars. So that first deposit earns about 77 dollars.

His later deposits sit for less time, so they earn less. A deposit made in the last month may earn almost nothing before he leaves. The exact total depends on the day each deposit lands and how the quarters fall, so I will not put a single figure on it. What matters is the pattern. Earlier deposits earn more than later ones.

So Marcus walks away with his 9,000 dollars plus whatever interest his deposits earned. He did not do anything fancy. He filled out a form, watched his statement, and let the account do its slow work. Simple habit, real reward.

Where it goes wrong

I have seen good folks lose out on this program, and it was never because they lacked sense. It was because life is busy and forms get forgotten. The most common slip is starting late. If you do not sign up early in your deployment, you give up months of interest you could have earned.

Another slip is going over the limit. The deposit cap is the current figure, which the official source publishes each year dollars, and money over that will not be accepted. Keep a running count so you do not get surprised.

A third trouble is forgetting when the interest ends. The account stops earning after the grace period that follows your time in the qualifying area. If you leave the money sitting and think it is still growing, you are only holding cash. Check the official page for the exact end date.

Some folks also mix this up with other savings tools. The SDP is not the Thrift Savings Plan, and it is not a bank account. It has its own rules, its own limits, and its own way of paying out. Do not assume one works like the other.

Last, do not skip the tax question. You have probably heard that pay earned in a combat zone can be tax free. That is not the same as the interest on this account. The interest is generally counted as taxable income for federal purposes, and your own situation may add wrinkles. Talk to a tax professional or your installation tax assistance office. They know your case better than any page can.

Questions to answer before you leave this page

Have you asked your finance office whether your deployment counts as a qualifying area? Do you know the deposit limit, and have you decided how much of your pay you want to set aside each month? Have you asked your finance office how soon your deposits can begin? Do you know when the interest stops after you leave, and what you plan to do with the money once it does? Have you checked your Leave and Earnings Statement to make sure the deposits are landing? And have you talked with a tax office about how the interest is treated for you?

Ask about this guide

A model reads this page and answers from it. It will say when the answer is not on the page. Education, not personalized advice.

Written by the site's growth engine and checked by its gates: voice, law and ethics, facts, arithmetic, and sources. Not yet read by a human editor; every page carries the correction process. Rules and dollar limits change every year; figures come from the rules table with their source and date.