IEnumerable yields instances of the same class

Please see the code below:

   public class TaxBands
        {
            decimal Limit;
            int Percentage;

            public TaxBands(decimal limit, int percentage)
            {
                Limit = limit;
                Percentage = percentage;
            }

            public TaxBands()
            {

            }

            public IEnumerable<TaxBands> TaxBandBySalary(decimal salary)
            {
                if (salary > 11000)
                {
                    yield return new TaxBands(11000, 0);

                    if (salary > 45000)
                    {
                        yield return new TaxBands(45000, 20);
                        if (salary > 45000)
                        {
                            yield return new TaxBands(45000, 40);
                            if (salary > 150000)
                                yield return new TaxBands(150000, 45);

                        }
                    }
                }
            }

Notice that the IEnumerable yields instances of the same class (TaxBand). Is this bad practice from an Domain Driven Development point of view? It works well, but I have never seen anything like this before.