Keep and submit PDFs of the following, as applicable:

* Your fare search (i.e., a screen shot)

* Your plane and rail tickets (e-confirmation of purchase is sufficient)

* Your hotel/lodging invoice

### Per Diem

* Use your per diem to cover meals and incidental expenses.

* Your total per diem allowance follows the rates published for your

  destination.  See the "Rates" section below for details.

* Try to be frugal: per diem rates are rather generous.

* When attending a conference where food is included, Do The Right

  Thing and claim a lower per diem.

### Reimbursement

* To receive reimbursement, send transportation and hotel receipts,

  along with a list of per diem days and totals, to

  section below for details.

* Your complete reimbursement request must be submitted to

  travel.  Untimely requests **will not be reimbursed**.

## Rates

Throughout this document, we refer to rates reported by other parties.

For travel in the United States, we follow the maximum rates for lodging and

M&IE per diem set by the

[US General Services Administration](https://www.gsa.gov/perdiem).

For travel outside the United States, we follow the maximum rates for lodging and

M&IE per diem set by the

[US Department of State](https://aoprals.state.gov/web920/per_diem.asp).

We calculate the total per diem allowance for a trip using the same method

as the GSA.  Travelers may request up to 100% of the listed rate for each

full day of travel, plus 75% of the listed rate for each partial day of

travel.  For example, if you fly to a conference on Monday, spend Tuesday

through Thursday at the conference, and return home on Friday, and the per

diem rate for the conference city is $80, you may request up to $360: $80

for each day Tuesday through Thursday, plus $60 for each day you flew.

When we convert currencies (e.g., to determine whether a hotel paid in Euros

was within the maximum lodging rate), we use the final rate published by