Bonding capacity limits are not fixed formulas - they are starting points that sureties use when they do not have enough financial history to trust the reporting. As the track record builds the ratios improve. A contractor with 24 months of accurate monthly WIP reporting will get better terms than the formula suggests.
Calculate your approximate bonding limits from net worth. Pull your most recent balance sheet. Total assets minus total liabilities equals net worth. Single-project limit: net worth times 10-15%. Aggregate limit: net worth times 20-25%. At $500,000 net worth: single-project $50,000-$75,000, aggregate $100,000-$125,000. At $1,000,000 net worth: single-project $100,000-$150,000, aggregate $200,000-$250,000.
Understand what reduces effective net worth in the surety's calculation. Sureties typically exclude AR over 90 days from the working capital calculation. They also normalize owner compensation to market rate before accepting the net income figure. Personal expenses in SG&A are added back. The net worth the surety uses may be different from what the balance sheet shows. Clean financials with personal expenses already removed and owner comp at market rate produce a cleaner surety analysis.
Build the WIP track record that allows limits above formula. The formula gives you a starting point. The WIP track record gives you access to limits above the formula. 24 months of monthly WIP from ControlQore with projections consistently within 5% of actual closeouts tells the surety that the financial reporting is accurate. At that point the conversation shifts from what the formula allows to what the business needs.
Grow net worth through retained earnings. Net worth grows when net income exceeds owner distributions. The overhead rate and markup directly drive net income. A 3-point overhead rate correction on $4M in revenue is $120,000 more net income per year. Over three years at $360,000 in additional retained earnings: bonding limits increase by $36,000-$54,000 in single-project capacity and $72,000-$90,000 in aggregate capacity.