Priority of Registered Documents under Section 50 of the Registration Act, 1908: Registered Against Unregistered, the Excluded Categories, Priority and Notice, and How Section 50 Differs from Sections 47 and 48

Section 50 answers the question a purchaser actually asks: if there are two documents about the same property, which one wins? Its answer is that a duly registered document of the kinds listed takes effect, as regards the property comprised in it, against every unregistered document relating to the same property. The registered document wins even if it is later in time, and even if the unregistered one is of a different kind. That is the reward the Act holds out for using the register, and it is what makes searching the register worth doing.

What Section 50 gives, what it excludes, and how it differs from Sections 47 and 48

1. The Section

Section 50, Registration Act, 1908, in substance

(1) Every document of the kinds mentioned in clauses (a), (b), (c) and (d) of Section 17(1), and clauses (a) and (b) of Section 18, shall, if duly registered, take effect as regards the property comprised therein, against every unregistered document relating to the same property, and not being a decree or order, whether such unregistered document be of the same nature as the registered document or not.

(2) Nothing in sub-section (1) applies to leases exempted under the proviso to Section 17(1), or to any document mentioned in Section 17(2), or to any registered document which had no priority under the law in force at the commencement of this Act.

The registered document need not be earlier. An unregistered sale deed of January loses to a registered sale deed of March by the same seller.
The documents need not be of the same kind. A registered sale may prevail over an unregistered mortgage, and the other way about.
Duly registered means registered in accordance with the Act, by an officer with jurisdiction, on a valid presentation.
It operates as regards the property comprised in the document, not generally between the parties.

2. What Is Left Out

A decree or order is expressly excluded from the comparison. A decree is a public act standing on its own footing, not an unregistered document in the sense of this section.
Leases exempted under the proviso to Section 17(1), being outside the compulsory scheme.
Documents mentioned in Section 17(2), the exempted categories, which were never required to be registered.
Documents that had no priority under the pre-1908 law, a transitional saving now of historical interest only.
Movable property. Section 50 lists only the immovable property clauses of Sections 17 and 18, so it does not govern competing claims to movables, although Section 48 does mention property of either kind.

3. Priority and Notice

Priority under Section 50 works alongside the doctrine of notice. Explanation I to Section 3 of the Transfer of Property Act deems a person acquiring immovable property to have notice of a registered instrument from the date of registration, where the transaction was required by law to be effected by a registered instrument. A later purchaser therefore cannot say he did not know of an earlier registered deed. Section 50 and the notice rule pull the same way: the register is the place to look, and what is in it binds those who deal with the property afterwards.

4. Sections 47, 48 and 50 Compared

	Section 47	Section 48	Section 50
The question	From what time does a registered document operate?	Does a registered document beat an oral agreement?	Does a registered document beat an unregistered one?
The answer	From the time it would have operated had registration not been required	Yes, unless the oral agreement was accompanied or followed by delivery of possession and is a valid transfer	Yes, as regards the property comprised in it, whatever the nature or date of the unregistered document
The exception	None, but it does not validate anything	Delivery of possession; and the proviso for a mortgage by deposit of title deeds	Decrees and orders, exempted leases, Section 17(2) documents, and pre-1908 cases

5. Section 50 and Section 48 of the Transfer of Property Act

Section 48 of the Transfer of Property Act ranks two valid transfers made by the same person at different times: the later transfer is subject to the earlier, where the rights cannot all exist together. It is a rule of time.
Section 50 of this Act ranks a registered document against an unregistered one. It is a rule of form.
They rarely conflict, because an unregistered document that required registration is not a valid transfer at all, and so never reaches the contest under Section 48 of the Transfer of Property Act.
Where both apply, as between two registered transfers, Section 50 is silent and the earlier in time prevails.

6. The Position Stated Shortly

Section 50: a duly registered document of the listed kinds takes effect against every unregistered document relating to the same property.
It prevails even if it is later in time, and even if the two documents are of different kinds.
Decrees and orders are excluded, as are exempted leases and Section 17(2) documents.
Registration operates as notice under Section 3 of the Transfer of Property Act.
Section 47 fixes when a registered document operates; Section 48 ranks it against oral agreements; Section 50 ranks it against unregistered documents.
Section 48 of the Transfer of Property Act ranks valid transfers by time; Section 50 ranks documents by form.