The annualized income installmentmethod is exactly like it sounds on the tin: it allows taxpayers to annualize tax for each period based on an estimate of income and deductions rather than in equal installments.
The proposed regulations provide that if a taxpayer sells an interest in an S corporation or partnership interest on the installmentmethod, any adjustment to net gain is computed in the year of sale and is taken into account proportionately as each payment is received and gain is recognized.