Difference between RDSA&RDSB21 May 2017 17:44
To begin, taxes are a key difference between the two issuances. The difference is due to this construct called the "dividend access mechanism." The B shares have the dividend access mechanism, while the A shares do not. What the dividend access mechanism allows B shareholders to do is to forego withholding tax (15% under Dutch law, verified by the Dutch Revenue Service). Withholding tax reduces the size of your investment earnings, so taking the right steps to not be subject to this is highly advised.
So, what is a withholding tax? Why is a withholding tax present? Quite simply, it is Dutch law: "Any payment by the Company will be subject to Dutch withholding tax (unless an exemption is obtained under Dutch law or under the provisions of an applicable tax treaty)". The withholding tax just means that 15% of your dividend received is cut. So, you'll effectively receive 85% in a net payout.