Section G 

4.  All indirect costs based on application of the indirect billing rates applied to the 

applicable cost bases.  

5.  All charges for Fixed Fee.  Subject to the withholding provisions of the contract 

clause entitled, "Fixed Fee" incorporated in Section I of the contract, the fixed fee 

specified above shall be paid in installments at the time of each payment for 

allowable costs, the amount of each installment being determined by applying to 

the amount payable as allowable cost a percentage reflecting the ratio of total 

fixed fee to total estimated cost. 

6.  Cumulative value to date of all billings against the applicable task order. 

Invoices for cost type task orders shall be submitted no more than every two weeks. A 

minimum amount of $500 per invoice is required, unless the invoice is a final invoice. 

There shall be a lapse of no more than sixty (60) days between time of performance and 

submission of an invoice. 

Invoices for firm fixed price task orders shall be submitted in accordance with the 

payment schedule in the order.  

Where performance based payments for task orders are involved, the Contractor shall 

not submit invoices nor will the Government approve payment until a defined event 

occurred and that the performance met the established criteria for success. 

Additional billing instructions, including submittal instructions, shall be provided under 

each individual task order issued under the contract. By execution of this contract, the 

Contractor acknowledges that invoice substantiation requirements may differ under each 

task order due to the varying nature of customer practices, and agrees to provide all 

data required by the task order Contracting Officer to substantiate invoices. 

G.8 TRAVEL AND PER DIEM 

a. Outside the Washington, DC Metropolitan Area: 

Travel by air will be reimbursed at actual not to exceed coach fare. Travel subsistence 

reimbursement will be authorized under the rates and conditions of the Federal Travel 

Regulations. Per diem will be reimbursed at actuals, not to exceed the per diem rates set 

forth in FAR 31.205 46 (in effect at time of travel), or at said per diem rates regardless of 

actual cost, whichever is in accordance with the Contractor's standard accounting 

practice or disclosure statement. When there is travel of more than 10 hours, but less 

than 24 hours, when no lodging is required, per diem shall be one half of the Meals and 

Incidental Expenses (M&IE) rate applicable to the location of the temporary duty 

assignment. If more than one temporary duty point is involved, the allowance will be 

one half of the M&IE rate prescribed for the location where the majority of the time is 

spent performing official business. The per diem allowance shall not be allowed when 

the period of official travel is 10 hours or less during the same calendar day. Travel by 

privately owned vehicle will be reimbursed at the current GSA approved mileage rate. If 

the Contractor incurs travel costs in excess of the amount shown in each TO, it is at its 

own expense. 

b. Inside the Washington, DC Metropolitan Area: 

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