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This paper assesses the relative importance of two key drivers of mortgage default: negative equity and illiquidity. To do so, we combine loan-level mortgage data with detailed credit bureau information about the borrower's broader balance sheet. This gives us a direct way to measure illiquid borrowers: those with high credit card utilization rates. We find that both negative equity and illiquidity are significantly associated with mortgage default, with comparably sized marginal effects. Moreover, these two factors interact with each other: The effect of illiquidity on default generally increases with high combined loan-to-value ratios (CLTV), though is significant even for low CLTV. County-level unemployment shocks are also associated with higher default risk (though less so than high utilization) and strongly interact with CLTV. In addition, having a second mortgage implies significantly higher default risk, particularly for borrowers who have a first-mortgage LTV approaching 100 percent.