Sample Letter Requesting Per Diem: Format Guide, Common Use Cases And Ready Templates

You just finished a 3-day work trip, paid for meals and gas out of pocket, and now you’re stuck wondering how to ask for reimbursement properly. A clear, professional Sample Letter Requesting Per Diem removes awkward back-and-forth, speeds up approvals, and ensures you get every dollar you are owed.

Too many workers miss out on eligible per diem simply because their request was vague, missing required details, or sent too late. This guide breaks down when to use this letter, shares copy-paste ready templates for every common scenario, and answers every question you might have before hitting send.

Why A Properly Drafted Sample Letter Requesting Per Diem Matters

Per diem is not a work bonus. It is reimbursement for personal money you spend while doing your job. Even if your team has an informal process, a written request creates a paper trail and removes all ambiguity.

This letter is the single most effective document to avoid delayed, reduced, or denied per diem payments. Before drafting any request, confirm these basics first:

• Official company per diem rates for your location
• Required proof of travel and work purpose
• Correct contact for expense approvals
• Company deadline for submitting claims

Different scenarios require slightly different wording. The table below shows critical details to include based on your request reason:

Sample Letter Requesting Per Diem For Out Of Town Business Conference

Subject: Per Diem Request – Q3 Regional Sales Conference October 12-15

Hi Sarah,

I am writing to request per diem allowance for my attendance at the Chicago sales conference last week. I traveled as requested by sales leadership to represent our branch.

Eligible dates: October 11 (departure) through October 16 (return). This equals 5 days at the standard $125 daily Chicago rate.

Total requested amount: $625. Conference registration, flight and hotel confirmations are attached.

Please let me know if you need additional documents. Thank you for your assistance.

Regards,
Marcus Reed
Sales Associate

Sample Letter Requesting Per Diem For Temporary On-Site Project

Subject: Per Diem Request – West Factory Equipment Installation

Hello Finance Team,

This letter requests per diem for my 6 week on-site assignment at the West Coast factory. I was assigned this role starting September 4 to support new system setup.

I work on location 5 days weekly with no provided meals. Eligible days: 30 working days at $78 daily county rate.

Total request: $2340. Verified on-site timesheets are attached. Please process with my next payroll.

Thank you,
Lisa Mendez
Field Engineer

Sample Letter Requesting Per Diem For Emergency Last Minute Travel

Subject: Urgent Per Diem Request – Data Center Outage October 3

Hi Robert,

I was called out at 9PM October 2 to travel 2 hours to resolve a critical server outage. I worked through the night and returned home the following evening.

This unplanned work required out of pocket meal and fuel costs. I am requesting 2 days at the emergency on-call rate of $110 per day, total $220.

Incident report and clock logs are attached. Please advise if you need further details.

Best,
Jake Torres
IT Support

Sample Letter Requesting Per Diem For Overnight Client Meeting

Subject: Per Diem Reimbursement – Greenwood Client Visit

Good morning Tina,

I traveled yesterday to meet the Greenwood management team and stayed overnight as approved to prepare for the morning contract presentation.

I am requesting 1 full day per diem plus overnight incidental allowance, totaling $142. This travel was pre-approved by David in client services.

Meeting confirmation and hotel receipt are attached. Thank you for processing this request.

Regards,
Emma Carter
Account Manager

Sample Letter Requesting Per Diem For Off-Site Training Course

Subject: Per Diem Request – Mandatory Safety Training September 18-20

Hello Expenses Team,

This is a formal request for per diem for the required workplace safety training I attended last week. All site supervisors were required to complete this course.

Training ran 3 full days at the regional facility 75 miles from my home office. Total requested per diem: $267 at the local off-site rate.

Training attendance certificate is included. Please let me know if anything else is needed.

Thank you,
Omar Hassan
Site Supervisor

Sample Letter Requesting Per Diem For Cross Department Work Visit

Subject: Per Diem Request – Logistics Team Visit August 7-11

Hi Maria,

I spent last week working on site with the logistics team to align our inventory tracking systems. This cross-department visit was approved in the Q3 operations plan.

I am claiming 5 days per diem for meals and local travel during this assignment, total $390. Daily check in logs are attached for verification.

Please process this reimbursement at your earliest convenience.

Regards,
Nina Patel
Inventory Coordinator

Sample Letter Requesting Per Diem For Disaster Response Deployment

Subject: Per Diem Request – Flood Response Deployment July 12-21

Hello HR Finance,

I was deployed as part of the company emergency response team to assist with flood recovery operations for 10 consecutive days last month.

Per employee policy, disaster response deployments qualify for the enhanced per diem rate of $165 per day. Total requested amount: $1650. Official deployment rosters are attached.

Thank you for your assistance with this request.

Respectfully,
Tom Wilson
Facilities Team

Frequently Asked Questions about Sample Letter Requesting Per Diem

When should I submit a Sample Letter Requesting Per Diem?

Submit your request within 3 business days of completing your travel or assignment. Most companies have a 30 day cutoff after which per diem claims will not be processed.

Do I need receipts when submitting this letter?

Most per diem policies do not require individual meal receipts. You will however need to provide proof of travel dates, work purpose, and approved attendance for the assignment.

Can I send this request via email instead of printed letter?

Yes, almost all companies accept per diem requests via email. Always send it from your official work email and save a copy of the sent message for your records.

How long does per diem approval usually take?

Most correctly submitted per diem requests are approved within 3-5 business days. Payment will typically be included with your next regular payroll cycle.

What if my per diem request gets denied?

First ask for a clear written reason for the denial. You can resubmit your request with corrected information, additional proof, or a confirmation note from your manager.

Should I include my manager on the request email?

Always carbon copy (cc) your direct manager on all per diem requests. This allows them to confirm the work assignment and speed up the approval process.

Can I request per diem for half work days?

Most companies pay 75% of the daily rate for partial travel days. Check your employee handbook for exact half day per diem rules that apply to your workplace.

Is per diem considered taxable income?

Per diem paid at official government rates is usually not taxable income. Amounts paid above standard rates will be reported as taxable earnings on your payslip.

What common mistakes cause per diem requests to be rejected?

The most common errors are missing travel dates, incorrect per diem rates, no proof of work purpose, and submitting after the company deadline. Always double check these details before sending.

Every one of these sample letters follows the simple structure that finance teams expect: clear purpose, exact dates, correct rates, and supporting proof. You can adapt any of these templates for your specific situation in under 5 minutes. Taking the extra minute to submit a clear, formal request eliminates almost all of the friction that delays reimbursement.

Bookmark this page for your next work trip or assignment. If you found these templates helpful, share this guide with coworkers who also travel for work. You never have to wait weeks for reimbursement or leave money you earned on the table ever again.