accounting/incomes/models.py

from django.db import models

# Create your models here.
class Income(models.Model):
    date = models.DateTimeField(null=True)
    source = models.CharField(max_length=150, null=False)

    # on forms to force only 2 dec
    # {{ value|floatformat:2 }}  # outputs 34.23
    amount = models.DecimalField(max_digits=10, decimal_places=2)