// Before:
List<InvoiceInstallment> installments = new ArrayList<InvoiceInstallment>();
Money installmentAmt = amount.divide(numInstallments);

Money amountAllocated = Money.ZERO;
for (int i = 1; i <= numInstallments; i++) {
    if (i < numInstallments) {
        installments.add(new InvoiceInstallment(i,
                             source.getPlan(),
                             installmentType,
                             installmentAmt,
                             payeeType,
                             discountPct,
                             null));
    } else {
        installments.add(new InvoiceInstallment(i,
                             source.getPlan(),
                             installmentType,
                             amount.subtract(amountAllocated),
                             payeeType,
                             discountPct,
                             null));
    }
    amountAllocated = amountAllocated.add(installmentAmt);
}
return installments;



// After:
List<InvoiceInstallment> installments = new ArrayList<InvoiceInstallment>();
Money installmentAmt = amount.divide(numInstallments);

Money amountAllocated = Money.ZERO;
for (int i = 1; i <= numInstallments; i++) {
    installments.add(new InvoiceInstallment(i,
                         source.getPlan(),
                         installmentType,
                         // Ensure installments add back up to total
                         i < numInstallments ? installmentAmt : amount.subtract(amountAllocated),
                         payeeType,
                         discountPct,
                         null));
    amountAllocated = amountAllocated.add(installmentAmt);
}
return installments;