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diff --git a/classes/OfferItem.php b/classes/OfferItem.php
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+<?php
+/**
+ * Provides the OfferItem class, an interface to database tables related to
+ * offers
+ *
+ * @author Camil Staps
+ *
+ * BusinessAdmin: administrative software for small companies
+ * Copyright (C) 2015 Camil Staps (ViviSoft)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * An abstract interface to a database table related to offers
+ */
+abstract class OfferItem extends Model implements Calculatable {
+	/**
+	 * Get the offer that this assignment is linked to
+	 *
+	 * @return offer                The offer
+	 */
+	public function getOffer() {
+		return new Offer($this->pdo, $this->offerId);
+	}
+
+	/**
+	 * The description after having parsed markdown
+	 *
+	 * @return string               The description in HTML format
+	 */
+	public function getHTMLDescription() {
+		$pd = new Parsedown;
+		return $pd->text($this->description);
+	}
+
+	public function calculateVAT() {
+		return $this->calculateSubtotal() * $this->VAT_percentage / 100;
+	}
+}