Many business savvy individuals reach for the credit card when it is time to pay up front on a large amount. Loans from banks or credit unions are also common.
But if you want to a higher chance to successfully get financing, you must first consider that you may not have enough collateral through a decent loan and percentages for your limited number of credit cards are ghastly high compared to another solution: Contract Financing.
Contract financing is possible for those who have a huge contract, but are burdened with little to no cash flow during the work. A contract is legally binding, and the government always pays, but it is required (usually) for all work per milestone to be completed first before you can get reimbursed.
If you cannot go into your funds any deeper, you may try looking into a lender with the capability to pay you most of your invoice (90% up front is common) while you wait for the government to release funds officially with almost no interest.
Most agencies require you to declare your ‘Financial Capability’ during the admission process – even as a subcontractor – your partners still like for you to show your financial reliability.