Whenever the balance in the Unemployment Fund on September 30 of any calendar year is less than 0.6 percent of the wages (as defined by Section 940) in employment, subject to this part, paid during the 12-month period ending on the computation date, employers shall pay into the Unemployment Fund contributions for the succeeding calendar year upon all wages with respect to employment at an emergency solvency surcharge rate. The emergency solvency surcharge rate shall be 1.15 times the rate the employer would have paid in Schedule F of subdivision (a) of Section
977, rounded to the nearest one-tenth of 1 percent.